I just saw a comment in which someone called Hasekura a rapist and a manipulator. Yeah , he forced Kensuke to do some things and I am not trying to say that it is fine but I still want to defend Hasekura. First, the condition he put to Kensuke: being lovers or end any kind of relationship. This can be seen as manipulative but I think it is just too cruel to force him to be friends with someone who he just cannot see that way. If any relationship ends up hurting either of them then it is better to end things as Hasekura proposes.
Regarding the things that Hasekura do to Kensuke as forcing a kiss in chapter one and the other things he does on chaper three, they show how desperate Hasekura is. I am not saying that we should overlook this because this behavior is wrong and Hasekura himself realizes this as we see in the last couple of chapters of Hitorijime my hero that are here in mangago. In the chapters Hasekura stops because he thinks that he is forcing Kensuke once again and he no longer wants that. He also waited for Kensuke to forgive him when he made a mistake before doing anything even when he did not like that Kensuke was with someone else (to know what happened you should read it) and they had a proper conversation. I like how this things show the development of the character.
Who is Sunwoo?