Kirara Hoshino: is shown to be Retto's first love. They have been friends since childhood and were very close. Later on, she grew colder, and didn't talk to him much.
Anno Jou: is his uncle, and also head of "Saitama Earth Diffence Force", retto's doesn't like so much his appearance, because he is ware feminine appearances
Momoka Momozono: is also retto's friend and member of Saitama Earth Difference force, she sometimes accidentally fell on retto in Erotic condition.
Sora Tenkuji: is also one of retro's friend and Member of Saitama Branch. When she slept, she came in retto's room and sleep with him.
Shirayuki Maihime: is very adorable to retto and careful for him.
Runba: Is retto's pet dog.
Chacha: is helping to retto for building his H Energy