As a monitor within the empty confines of the school library, Mei, a novice first-year pupil, finds herself captivated by a male student whose hair mirrors the hues of a picturesque sunset. Despite not expecting any future run-ins with him, she's caught off guard when he appears the following day, only to quickly exit without uttering a single word after drowsing off. Mei is left pondering his secret identity and the daily schedule that leads to his sudden vanishing act.