Marisa asks if Rinnosuke has a girlfriend. When he says he doesn't, she tells him she'll become his bride when she grows up. Rinnosuke counters with a teasing "Boys can't become brides." which is a poke at Marisa's tomboyishness.
Is this actually genderswapped? Young-Marisa is usually drawn with short-ish hair and a flat chest, and I thought Rinnosuke's "boys can't be brides" was just him making fun of her boyishness, like Touy said above. I don't know if there's anything from the artist that confirms/disproves genderswap.
A girlfriend? No, I don't have one. Why?Then when I grow real big, I'll be your bride.Hahaha, I'm glad, but boys can't really become brides.Huuuh...