So Ranma 1/2 is one of my favourite manga series of all time. I only ever got to vol. 15 though when I read them when I was younger. But I am now re-collecting them and I am very excited about that!
I won't obviously be posting actual pages and whatnot from the manga here because GO READ IT SERIOUSLY IT'S GOOD, but I will be covering the different volumes when I read them. This can serve as an intro to people who haven't read the series and don't know if they're interested, or if you're already a fan, you can come reminisce as I talk about them, or you can make comparisons if you're a fan of the anime.
Also feel free to generally discuss Ranma 1/2 here because it's Ranma 1/2 and we should discuss it!
Volume One
So our titular character, Ranma Saotome<-- this dude, is a 16-year-old martial artist who recently went on a voyage of training with his father Genma
. They have now returned to Japan as Genma has made a special promise to his friend Soun Tendo
a rather intense and dramatic moustachio'd man.
Genma promised that his son would marry one of Soun's three daughters:
19 year old Kasumi, the sweet homemaker motherly type,
17 year old Nabiki, the opportunistic sister,
or 16 year old Akane, the martial artist who says she hates men.
That way Ranma can inherit the Tendo dojo.
There is one little issue though. You see, on their recent training trip to China, they visited the ground of Accursed Springs, where many things have drowned. Now anyone who falls in these springs will take the form of whomever drowned there. Wouldn't you believe it, both Ranma and Genma fell in.
Ranma fell in the spring of drowned girl and now turns in to a girl when splashed with cold waterand Genma now takes the form of a panda when splashed with cold water
. Both revert with hot water.
Because of this little quirk, Kasumi and Nabiki are quick to pass off the engagement to their younger sister, Akane, using the excuses that she hates boys anyway and this one is half girl.
Akane and Ranma get off on the wrong foot after some sparring matches, finding out about his secret, and some accidental bathtime hijinks, so neither is particularly excited about this engagement. But now it's school time!
Ranma's first day is eventful as he learns that Akane has an army of suitors looking to best her in battle for a chance at a date. Chief among these is Upperclassman Kunoa rather absurd young man who is both full of himself and of love for Akane. He's not super pleased to learn about the engagement, as you can imagine. This leads to Ranma and Kuno fighting, and at some point Ranma turns in to a girl. Kuno promptly falls in love with this girl. Nabiki
uses this opportunity to sell Kuno pictures of both of them. There is more fighting. Ranma wins.
Ranma and Akane find the pictures Kuno was in possession of and Ranma makes a comment about how Akane will never find a husband. She beats him up. Time for a trip to the doctor! Dr. Tofu to be precise, a man that Akane has had a crush on since her childhood. Usually a competent doctor, he is in love with Akane's older sister Kasumi, and when in contact with her he turns in to a bumbling fool. Also Mr. Saotome, Ranma's father, gets a job as Dr. Tofu's assistant. Panda form only
.
More hijinks involving these plot points ensue, Ranma is injured many times over, and then a new threat emerges. It goes by the name of Ryoga. Ryoga is a super strong boy from Ranma's old school who is out for revenge. He also has a terrible sense of direction and gets lost several times before arriving to challenge Ranma. Ranma can't remember why he wants revenge, except maybe for all of those times he got the last lunch bread over Ryoga.
The fight day finally comes, at which point TRAGEDY STRIKES and one of Ryoga's weapons cuts Akane's hair clean off. She has a humiliating haircut and asks for Kasumi to fix it for her.And short-haired Akane is born! We find out she originally grew it out because her sister mentioned when she was younger that Dr. Tofu might like her more if she wasn't such a tomboy, and Akane decided to grow her hair out like her sister. Dr. Tofu tells her she always looked better with short hair.
So that's the fist volume! I don't like this one as much as most. It's still the intro and it's got a lot going on, but it doesn't quite find it's rhythm yet.

					
						
					
						
					
 <-- this dude, is a 16-year-old martial artist who recently went on a voyage of training with his father Genma 
. They have now returned to Japan as Genma has made a special promise to his friend Soun Tendo 
 a rather intense and dramatic moustachio'd man. 
19 year old Kasumi, the sweet homemaker motherly type,
17 year old Nabiki, the opportunistic sister,
 or 16 year old Akane, the martial artist who says she hates men.
 and Genma now takes the form of a panda when splashed with cold water 
. Both revert with hot water.
 a rather absurd young man who is both full of himself and of love for Akane. He's not super pleased to learn about the engagement, as you can imagine. This leads to Ranma and Kuno fighting, and at some point Ranma turns in to a girl. Kuno promptly falls in love with this girl. Nabiki 
, a man that Akane has had a crush on since her childhood. Usually a competent doctor, he is in love with Akane's older sister Kasumi, and when in contact with her he turns in to a bumbling fool. Also Mr. Saotome, Ranma's father, gets a job as Dr. Tofu's assistant. Panda form only 
. Ryoga is a super strong boy from Ranma's old school who is out for revenge. He also has a terrible sense of direction and gets lost several times before arriving to challenge Ranma. Ranma can't remember why he wants revenge, except maybe for all of those times he got the last lunch bread over Ryoga.
 And short-haired Akane is born! We find out she originally grew it out because her sister mentioned when she was younger that Dr. Tofu might like her more if she wasn't such a tomboy, and Akane decided to grow her hair out like her sister. Dr. Tofu tells her she always looked better with short hair.
					
					
					
						
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. Getting close to Akane in pig form also causes Ryoga to develop feelings for her. Luckily Ranma agrees to keep his secret by not outright telling Akane, but at the same time he likes to drop hints for her to find.
, younger sister to Upperclassman Kuno 
. Azusa likes to name things she thinks are cute and then take them. Yes, that is illegal. She names P-chan "Charlotte". Akane is displeased by this, of course, and Azusa's partner, Mikado 
 shows up to be his womanizing self and try to kiss Akane. Ranma and Akane are not having that, and Ranma challenges Mikado to a duel. The event will be pair skating.
. Shampoo is a Chinese amazon warrior, strongest in her village according to a tournament she had just won. Unfortunately, Genma and Ranma (transformed) ate her prize meal. Challenging female Ranma and losing, Shampoo hit him with the "kiss of death", a promise to follower him (her, in this case) to the end of the world and kill her in order to recover from the shame of losing to an outsider.
, another suitor for Akane 
 have moved to Japan and opened a ramen restaurant. Secondly, Cologne and Shampoo are still hellbent on Ranma marrying Shampoo, and third, while training with her great-grandmother, Shampoo fell in to one of the accursed drowned springs. She now turns in to a cat 
.
 who is madly in love with Shampoo but was unable to best her in battle in order to earn her hand in marriage. Mousse has incredibly poor vision when his glasses are off and is known as the hidden weapon master. It doesn't take long for him to challenge Ranma to a duel. Because Cologne still refuses to give Shampoo to Mousse, Mousse instead says that if he wins, he will still Akane from Ranma.
 are fighting. Cologne is the cause of Ranma's situation and has promised him the cure if he can defeat her in battle. Cologne has summoned a shark to help her fight.
, Cologne's granddaughter and woman in love with Ranma, for help. This involves tying her to himself as he goes back in the water. You see, when splashed with cold water, Shampoo turns in to a cat 
, and Ranma just so happens to have a fear of cats. This causes him to enter the deadly Cat Fu mode, where he thinks he is a cat. After taking a huge bite in to the shark, Cologne gives him mad props and hands over the Phoenix Pill which will allow Ranma to change back in to a man with hot water.
 is back in town and of course decides to challenge Ranma to a fight. Turns out, however, that Ranma 
 has gotten a lot stronger thanks to his scuffles with Cologne. Humiliated after Akane 
 Ranma's fiancee and woman Ryoga loves, tells Ranma to stop picking on him, Ryoga accepts Cologne's proposal to train him.
 are off training in the same woods as Ryoga and Cologne. They bring Akane along, who turns out to be the worst cook ever, who defects to Ryoga's camp after he manages to gratefully eat her food to the best of his ability and Ranma only insults it. Ryoga is learning the "Breaking Point" technique, a technique said to destroy anything if he can only touch its breaking point. Cologne then offers up Akane as the prize for the Ranma and Ryoga match. After some intense battling, Ranma and Ryoga fall off a cliff, turning Ryoga in to his pig form of P-chan 
 and wins the fight. Cologne then reveals that the breaking point technique only works on rocks.
 on it. Sentaro decides that Ranma should be his bride, drugs him (as a her), and dresses him in a wedding kimono. Ranma, predictably, is not happy. Sentaro explains that he's in an arranged marriage in which he cannot stand the bride and wishes for Ranma to defeat her and take her place. The challenge: Martial Arts Tea Ceremony. With his pride as a martial arts whatever champion, Ranma agrees to fight. Ranma also takes this opportunity to reveal his manhood to a shocked Sentaro, and Akane arrives at the scene. Sentaro quickly proposes to Akane as well, who doesn't want to marry him, but does want to show that she can perform the graceful tea ceremony. She can't.
, who turns out to be a monkey. All is well however when during the challenge, the REAL Satsuki arrives on a runaway horse and turns out to be a beautiful woman. Suddenly Sentaro is A-OK with the marriage and the two head off on their honeymoon 
. After making a quick stop on Ranma's head.
 has decided that it is time to decide between Akane and "Pig-tailed Girl" (female Ranma), and tells them that whoever arrives at his house first will win his heart. Coincidentally at the same time, Akane, Ranma, and Shampoo all enter a martial-arts delivery girl contest. The goal is to reach a randomly selected house before anyone else. The randomly selected house? Kuno's.
, the martial arts master that trained Soun 
 and Genma 
. Ranma doesn't take kindly to this and challenges Happosai to the first of many battles. Happosai forfeits during the fight to scope out the girls locker room.
 decides to step up to his old master and also turn giant. Sadly they both wear themselves out after using up their battles auras and neither emerges the victor.
, and Happosai 
, meanwhile also made some treats for Ranma. She steals Akane's cookies, who fusses at Ranma to go get them back. Unfortunate timing while Happosai is stealing underwear leads to Ranma getting trampled and falling on Kodachi. Gosunkugi caught it on film and Kodachi uses this opportunity to buy the pictures from him, Photoshop them to make it seem like she and Ranma are kissing, and then blackmail Ranma to come to her house. Akane is upset that he's going over because Ranma won't tell her what's going on and she thinks he prefers Kodachi's food.