Mihato Uesugi

As Ren's devoted older half-sister, this runaway companion serves as Miyu's personal maid while struggling with an intense, comedic "brother complex." Known for her eccentric habit of concealing various items across her person, she often experiences deep loneliness when separated from Ren. Her extreme jealousy occasionally leads to dark, humorous impulses to eliminate anyone distracting him from her, though these murderous whims are played for laughs rather than genuine malice.