Sex friend who was really a classmate in love with MC pretends to be MC's unrequited love in order to get his affections. MC forgives him once he realizes he did it out of love. Love triangle is Seno --> MC--> Hakushima --> Brother's wife Hakushima walked into traffic because of his love for his brother's wife. Both Seno and Haku felt that people did not like them for who they are as a person. Seno learns to be himself and that he can receive love for being himself. Both Seno and MC also felt that without their 'shell', no one would love them and it wouldn't matter if they were gone.
I enjoyed reading this even though I was spoiled by knowing that there was a twist. I knew then that "Hakushima" really was Seno, but I enjoyed it anywas because then I could see the red herrings.
Kakkou no Yume