Rage
Doesn't Know Code, Fools.
Great....Kuma has two bad sisters....Perfect however he'll deal with it.Rage
Riba is a girl who Kuma meet in middle-school as a result it lead to them having a relationship similar to "brother and sister." The reason behind it is that they have had plenty of interactions which lead to positive and nice moments. He also is rather protective of her and provides a older brotherly presence despite the fact he is younger than her.
Decided to read over it and I do have to say that a relationship with Riba wouldn't be very positive. She has respect for Kuma for his upbringing being similar to her, leading to her not snapping at him very easily but she still will snap. She doesn't outright avoid him but isn't one to make small talk either or give a positive attitude for him.