
First chapter and the last chapter but can anyone explain to me the 6 chatper? I think i cant understand. And somehow i dont like that haruka ewh

In case, you're still confuse. This is my understanding.
Natsuno (white-haired) after they made love "attempted" a suicide. Natsuno was talking about "if I were to die situation" so maybe he did plan on killing himself, even before Toru (black/blue-haired) told him about his future plans (marry haruko, being an architect, having a newspaper article with his name on it). I think the reason why Natsuno wanted to die is he's somewhat stopping the curious Toru from doing things. (Like when Toru, Haruko and friends are supposed to hang out but didn't 'cause Natsuno is not feeling well.)
When Toru( black-haired) woke up he saw Natsuno's (white-haired) "dead body". Believing that Natsuno died, Toru killed himself too. BUT!, Natsuno didn't actually died, it was a FAILED suicide, contrary to what happened to Toru (black-haired), Toru really did die.
It's a given that Natsuno(white-haired) would blame himself for Toru's(black-hair) death. So Natsuno live to fulfill Toru's dream/wishes (He become a successful architect, have a newspaper article of him, and... let's just exclude Haruko.) Natsuno, also, dyed his hair black/blue, thats why his hair is black and not white anymore- which is the root of the confusion.
I planned to explain it as little as it can be, but when I typed Natsuno and Toru's name, the urge of explaining why they did this and that arise. Sorry,I just can't help it. It's my favorite one after all. Hope this help. (=・ω・=)
Awww.. I though harada will be uke, cz hajime is so semeable. :3