Bishoujo to Kyori wo Oku Houhou (Light Novel)

One day, the self-proclaimed “Selective Bocchi” Kusuba Ren, saves Tachibana Rika, a beautiful girl who is called “Takatsuki no Hana”, by chance. Rika forced him to get paid back, but his relationship with Rika did not end there. Their favorite shop is the same, they have a mutual friend, and they live next to each other. No matter what they do. They are, apparently, always together. However, as they continue their routine, they gradually open up their hearts to each other.