Ryota is easily Kensuke's best friend since they have known each other since middle school, perhaps even longer.[17] Though he's fully aware of the fact that Ryota likes to tease him, he doesn't pay it any mind most of the time. Kensuke is able to tell what Ryota is thinking most of the time.[18] He's sometimes Ryota's voice of reason for when the latter is faced with more serious problems.[19] Kensuke's also the first person who found out about Ryota's fear of bugs and is the one who's mostly the target of Ryota's lectures about cleanliness.[20][21] Kensuke was the one who revealed that Ryota's ears go red when he's shy[22] and Kensuke's the first one that Ryota goes to when he's scared.[23]