Tadakuni/Relationships

Nago-san
Nago is Tadakuni's friend and co-worker at Pizza-Le, whom he addresses with the honorary suffix -san. He respects her knowledge and judgement regarding various matters and is generally seen asking her questions. He does not mind opening up to her about his worry that his friends were neglecting him, showing the two to be quite close.

In addition, both Tadakuni and Yasunori seem to be smitten by Nago's alternate appearance - the Convex Mirror girl.

Yoshitake and Hidenori
The two are his best friends. Despite the fact that he often doesn't understand some of their role-plays and maintains a sense of reality no matter how far into the game the other two are getting, neither ever chastises him for ruining the game or for taking the fun out of it.

Rather, Tadakuni's 'one clueless character' is a common trope in their 'adventures'. They always enjoy his company, but Tadakuni feels a great amount of isolation in the trio at certain stages, feeling like he's the odd one out or that they might be holding themselves back around him because he's not on their wavelength.

He always shows great courage when he thinks about trying to be better friends with them, never giving up despite his occasional paranoid self-isolation – although sometimes he mistakes them for another unknown pair while trying to talk to them.

Tadakuni's younger sister
The two don't have a good relationship and it's said that they talk to each other around once a month. Tadakuni, despite his "normalcy" and wariness of her strength, goes along with pranks involving her underwear. She tends to listen in on his conversations with Yoshitake and Hidenori and it's because of this that she also gets carried away by his made-up stories.

His sister seems to lack confidence in him, having approached other boys in his school for help when she was in trouble, rather than talking to him.

Other
Tadakuni is good friends with Kugihiko. He is also friends with Motoharu, Karasawa and Mitsuo who are in his extended friends' circle, but hasn't been shown interacting directly with them much.

Like those among his friends who know her, he's scared of Yoshitake's older sister.