An A class student who excels in health.
In episode 2, she fights against Kouta and loses. On numerous occasions, Aiko exploits Kouta’s perverted tendencies for her own gain through teasing him or outright flashing him. One example is in episode 19 where the summoned beings reveal their master’s secrets against their will. While Kouta acts disinterested, his summoned being enthusiastically responds to her teasing. Another example is at the beach in episode 16 where she teases him constantly.