Yuudai Moroboshi/Relationships

Koume Moroboshi
Koume is Yudai's little sister. Yudai cares for her deeply, although sometimes teases her. Three years ago, Yudai was greatly injured during an accident, which left him crippled. Koume blamed herself for what happened, ceasing from speaking. Yudai though, didn't want Koume to blame herself, leading to him undergoing rehabilitation and become far stronger than before. Despite remaining silent for a while, Koume finally spoke during Yudai's match against Ikki.

Mother
Yudai and his mother often treat each other aggressively, but actually care for each other quite a lot.

Byakuya Jougasaki
Byakuya is a friend of Yudai. They faced each other in the finals of the 61st Seven Stars Sword Art Festival, with Yudai winning. They have shown having a good relationship, though Yudai doesn't completely agree on Byakuya's views on fighting.

Kiriko Yakushi
Kiriko helped Yudai during his rehabilitation, and they still have a friendly relationship, with Kiriko performing regular examinations on Yudai. Despite knowing each other for a long time, their relationship isn't romantic, as Kiriko has mentioned that Yudai isn't her type.

Ikki Kurogane
Yudai and Ikki respect each other, and recognize each others skills. The have a rather friendly relationship, with Yudai offering a free meal to Ikki and his friends before their match.

Tohka Todo
Yudai and Tohka faced each other in the semi-finals of the 61st Seven Stars Sword Art Festival, were Yudai managed to defeat Tohka. They are shown having a rather close relationship, and have been shown discussing their future plans with each other.