Sei Toudou

__Height:__ 183 cm Sei is one of [Ichika](https://anilist.co/character/2869/Tachibana-Ichika)'s tutors, and a high school student. He instructs her in grammar, literature, and social sciences. He is introduced as the twin brother of [Kai](https://anilist.co/character/6605/Toudou-Kai). Of the two, Sei usually seems to be the calmer, gentler one. Ichika has developed romantic feelings for him.