Kohai and mini kohaiThis sounds like he's being prepared for the eventual "pregnancy reveal."
Yeah. In other cultures it might not be such a big deal, but... in Japan, asking a girl to move with you is basically asking for her hand (and other kinds of permissions).He PROPOSED to her. What do you mean "if it's okay with you?" Dude, that's your future wife, man. Of course it would be okay!
Luckily Japan already has strict building codes regarding earthquak proofing buildings.When they get their own place it better be well soundproofed