Tsujitani Yamato

The protagonist's classmate and only shown male friend. He refers to the protagonist as "Comrade," and adds "Lady" (-jou) to the female characters' names (ex. Lady Asamiya/Asamiya-jou for Himari). He has an entertaining dynamic with Io due to their quirky personalities, and she refers to him as "The Keeper of Secrets." He shares a resemblance in appearance and personality with Suginami from the popular Da Capo games, also by Circus.