
Oh god... now we know why he was so violent. Oh my, I'm so sorry for him. Aah, both sides of the story are sad. I just wish that he will become happy as well...

That is the one, right?: http://www.mangago.zone/read-manga/hadakeru_kaibutsu/
But it starts in the middle. When their relationship is already established. Is there another one?

http://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/ ( ch 4-5)
Hadakeru Kaibutsu is a sequel.

I hope they don't end up together and this becomes a manga about friendship and accepting yourself. But it would also not be too bad when they would become a couple. Isn't there a manga where they are just friends and the hetero helps the gay friend to accept him and his sexuality?

Yeah I would also like manga like that - where it's actually about acceptance and friendship more than romance. The only one that I know of is Ike Reibuns's Ani no Hanashi. It's more of a familial acceptance though. I just wish there's more manga that would explore the feeling of sincerity and tolerance to those who are different.
Great story of fighting for what you think is right. I love that he is so composed and keeps his goal in mind. Fantastic manwha!