Responses
It's explained right here: http://www.mangago.zone/read-manga/orange_takano_ichigo/mh/c022/47/
There are parallel worlds where different things happen.
You can look at it like this:
Universe A->Suwa+Naho, Kakeru still dead
Universe B->Kakeru+Naho, Suwa becomes a famous athlete
at the end.. naho with suwa and kakeru is still alive or naho with kakeru?! I'M CONFUSED
and crying T^T