Man, the author sure was stingy with giving Rina so few screentime.
@mintdang5566 Last year I think I read him saying he was just going focus on a new work, nothing about a sequel IIRC. Also the dlsite description says this was the final chapter of a trilogy. Also, I think the author is aware that Rina is more popular than the main heroine Nanami lol, gyaru ftw.