.Hack//G.U. for me. I didn't watch Roots first so I really had no idea what was going on. So yea they mystery was there for me. And then in Part 2 my favorite character went MIA and it was really sad. Especially since they kind of played it up like maybe, just maybe he was going to make it in time. But nope. That whole scene was so heart wrenching. And then finally at the end of Part 3 it made me go awww.