Not actually her sister. Legally-speaking, they're adoptive cousins- Tokiko is Chitose's grandmother, and Tsukasa's 'legal grand-aunt'. I dunno where that detail specifically comes from, exactly, but that's what the wiki says.How old is the Wifey’s sister? Kinda expected her to be in the class and cause a scene (maybe in the school). Anyway interested. The MC is no nonsense and straightforward so at least a harem isn’t going to happen.
Was expecting sister-in-law to be in class or same school.
She can't be in the same class- she's a middle schooler, not a high schooler.@daime17
I am thinking the same or she found out and "coincidentally" became an exchange student that "coincidentally" fit the duration of his teaching.