Afraid of others and unable to leave her house. While she is shy, delicate, and overly sensitive to how others perceive her, she is fundamentally kind and possesses a core of strength that allows her to take decisive action when it matters most. Born in 2006. 1st year middle school student. Addresses girls with -chan and boys with -kun.

A 1st year middle school boy invited to the castle like Kokoro. Kind and refreshing to everyone, he acts as the leader of the group. While he appears to be a pleasant young man at first glance, he hides a deep loneliness and a sense of responsibility to protect those dear to him that is stronger than anyone else's. Born in 2006. 1st year middle school student. Addresses girls with -chan and boys with -kun.

A bright, strong-willed, and reliable girl who acts like a big sister, but internally she is more easily hurt than anyone and carries a loneliness that is at its breaking point. Born in 1979. 3rd year middle school student. Addresses girls with -chan and boys without honorifics.

Gentle, quiet, and so timid that she is constantly gauging others' reactions, yet she is a hard worker with an extraordinary passion and grit for the piano. Born in 2000. 3rd year middle school student. Addresses everyone with -san.

Prone to falling in love easily, boastful, and often spinning his wheels, but in truth, he is just a lonely boy who purely and strongly wishes to be accepted by someone. Born in 2014. 1st year middle school student. Addresses girls with -chan and boys without honorifics. Falls for cute girls instantly.

A boy who loves games and may seem prideful or cheeky, but is actually caring toward his friends and honest enough to admit his mistakes and apologize. Born in 2007. 2nd year middle school student. Addresses everyone without honorifics.

A boy who looks tall, cool, and mature, but possesses a bottomless kindness that allows him to be an ally to anyone, along with a somewhat detached, calm demeanor. Born in 1972. 1st year middle school student. Addresses girls with -chan and boys with -kun.

She takes a harsh, dismissive attitude toward the middle schoolers, but behind that lies a strong sense of mission and affection, wanting to save them. She is blunt and acts like a little queen. Speaks in a haughty, arrogant tone like a small child trying to act big and bossy, using sentence endings like "-da zo" and commanding others with "-shiro."