I think it’s to cap off that he’s specifically “happy that she’s alive” considering how badly she wanted to kill herself previously.Why is something like this an "extra story"? It's literally him just saying hey, I like you a lot still. An actual extra story would be something like running into the brother with him or her telling the kid she fucked her brother. This is just a waste.
Based opinion from that Jap guyImagine having a girlfriend who will always compare you to her brother that's crazy.
Also the comparison to the west and jps reaction is funny. JP is happy while the west fucking hates everything going on in the ending. (There was one based Jap who said the author should have the boy fuck his sister and cuck the imoto tho.)