Responses
even if they were went to hospital he couldn;t saved cause look http://www.mangago.me/read-manga/boys_love/tr/84405/page/196/ how long this kitchen knife and how deep it was in so he thought even if he were to die he would like to go to sea with him and they went he was happy and he went to sea cause he would never love some onne like this and couldn't part him so tragic yet true love story
i think it was becausse they where afraid should he have died in the hospital...
and then he could keep his promis to him...
the ending sucks like Mamiya should just brought him to the hospital first than the ocean since they can enjoy the ocean all they want if he were to live. how dumb can he be?