Responses
Yeah, the dad could be anyone else. I think she probably knew about Sentarou's crush and that's why she put them together, as one final "let's do something crazy and hope that this time it'll work out."
this might me be it yes
I’m betting neither are the dad and that’s why she didn’t want a DNA test. I’m wondering if she’s actually a child Ririko took in to experience being a parent before she died? Guess we’ll have to see