I think it means that when they are together, they do silly things together and let lose, thus making them become "bad" when they hang out. So I guess a friend she is so close with that they are comfortable to be "bad" with instead of restraining themselves to be polite and nice etc.
I think it means that when they are together, they do silly things together and let lose, thus making them become "bad" when they hang out. So I guess a friend she is so close with that they are comfortable to ... NyankoLily
There's a bit where she said the heroine is not speaking honestly tho
I hope sunny gets with kanenogi-san's stalker, the one with the white uniform