Kai Toudou

__Height:__ 185 cm Kai is [Ichika](https://anilist.co/character/2869/Tachibana-Ichika)'s other tutor. He teaches her math and science. He is introduced as the twin brother of [Sei](https://anilist.co/character/6604/Toudou-Sei). Of the two, Kai seems the more extroverted one and more physical in nature and seems to have developed feelings for his twin brother, Sei.