The leader of the Seven Wonders who resides in the third-floor bathroom of the old school building. He takes the form of a boy wearing a black gakuran, an old hat, and a seal talisman on his cheek. He acts like an innocent prankster but occasionally reveals a cold and sharp insight. While he mocks Guest's reckless determination, he finds himself unable to leave her side, watching over her instead.

One of the three main protagonists alongside Hanako and Nene. He is a third-year student in the middle school division, Class 1. The second son of an exorcist family, he has a 17-year-old brother, Minamoto Teru, and a 5-year-old sister, Minamoto Tiara. While his first major role begins in Chapter 3, he actually appears in Chapter 1—he was the person Nene bumped into instead of Minamoto-senpai during her 'running with toast in mouth' plan. He has blonde hair and blue eyes, and wears a red earring on his right ear that serves as a protective charm for traffic safety.