Kiyotaka is an inconspicuous student who is very poor at communicating with other people even if he wants to, thus he tends to isolate himself. His emotions are hard to read. He received "perfectly intermediate" scores on his entrance examination, since academic and athletic-wise, he is average. (Source: Official site)

Dazai Osamu is based on a Japanese author by same name. His ability No longer human is also based on Dazai Osamu's popular Japanese novel by same name.