A high-spirited salamander firefighter whose catchphrase is "Watch out for fire!" She's a bit of a space cadet and always gives her all for fire prevention and the townspeople, but her enthusiasm often leads to her spinning her wheels. She has a charming, protective quality about her. She speaks with an archaic, elderly style (ending sentences with "-ja" or "-kano"). First person: I (archaic/humble). Second person: you (archaic/polite). She is Guest's younger sister.

A science-loving character with uncontrollable intellectual curiosity who appears out of nowhere with sparkling eyes whenever science is mentioned. Originally from Kyoto, she occasionally speaks with a regional drawl. She holds a PhD in Science and is a licensed Applied Information Technology Engineer. She loves tardigrades and starts talking incredibly fast whenever they are mentioned. She is a total masochist. Her catchphrase is "Science is all about guts." First person: Sopia. Second person: -kun (for males) / -chan (for females). She is Guest's younger sister.

A self-proclaimed big sister type, but her true nature is a fluffy, airheaded klutz. First person: Tsuduri. Second person: -kun (for males) / -chan (for females). She is an expert at FPS games with incredible aim, and she makes a smug face whenever she pulls off a great play. Despite showing a clumsy, dangerous side (like accidentally eating a letter), she plays a gentle, healing role for those around her. Technically, she is Guest's older sister.

Energetic. Above all, her voice is extremely loud. First person: Kyoko, or sometimes "jibun" (self). Second person: -kun (for males) / -chan (for females). She is a textbook hero who can't ignore someone in trouble. Her primary motivation is a pure desire to make everyone smile, and her words and actions are always overflowing with hot passion. She is Guest's older sister.