Okay so I've got all of the endings now, and whoa. Like, the final scenario was like three times as long as the rest of them combined, and it was a murder mystery rather than a dating sim.
(SPOILER)You are murdered halfway through the school year, and upon finding your head in a box, the childhood friend character Ryouta decides to find out who did it.
So yeah, this is totally a murder mystery visual novel disguised as a dating sim. Ho ho ho!
EDIT:
Also look what I did you guys
I engulfed the world in pudding.