Relationships
Iu Shindo[]
Yotsuya considers himself out of her league. Although (it seems according to the manga) that he likes her, he also thinks they don't mix well. After Shindo's proposal to start dating, he decides to put it on hold.
Kpo[]
Yuka Tokitate[]
Kusue Hakozaki[]
As of chapter 89, it is confirmed that Kusue is the girl that has more influence on Yotsuya out of the group. When narrowing down the options for a girlfriend, she's the one that comes to his mind. It also seems that Kusue is also interested in Yotsuya (seemed like it in chapter 90, verified in chapter 97).