Kai Toudou

Birthdate: June 15, 1984
Height: 185cm
Blood type: A

Kai is Ichika's other tutor. He teaches her math and science. He is introduced as the twin brother of Sei. Of the two, Kai seems the more extroverted one and more physical in nature. Ichika seems to have developed feelings for his twin brother, Sei.

(Source: Wikipedia)