Shuusuke Takanashi

Nao's older brother. 1st year high school student. He's interested in his sister but just can't seem to get his hand to her. When he was younger, he was really perverted and used his childhood friend Tsuchiura Iroha play doctor with him, as he wanted to see a girl naked. However, she made him promise that if he let him do anything, make her his lover.