Aw that promise was broken, UTA COME BACK
well obviously Risako was in love with Kaoru but being her best friend and confusing emotions wound up with her dating Reichii.
Bet they break up soon in the following chapter so Reichii can support Kaoru as her childhood friend (regarding whatever happened to her mom) but at the same time Kaoru eventually becomes his rebound.
And Risako drifts even further apart despite her feelings cuz well it’ll be really awkward
Though I do have my doubt on whether Reichii did cheat or not. I feel like it would be a twist if he didn’t but tried to at least. I don’t see what Risako would have to gain, Besides info about how Kaoru is. Perphaps Reichii still does love his ex too. Which is why he isn’t into having a baby soon, while Risako made the suggestion in the first place so she could TRY to put her emotions behind her.
Or who knows they did it cuz why not.