He is a depicted as a high school boy who often conjures up weird, and often perverted, thoughts in his mind, with Haruka describing him as such. He is also a bit of a dimwit, having an easy-to-read and transparent mind. He loves teasing Haruka by showing her perverted images in his mind with her mind-reading abilities. However, he is also a caring person who is easy-going and very friendly, shown when he was willing to befriend Haruka even though she was labeled as a freak by his other classmates

(http://kotoura-san.wikia.com/wiki/Yoshihisa_Manabe)