Natsuki Taiyou lives by the motto 'Live with sincerity.' On his inaugural day at high school, he encounters a captivating girl named Hinata. Smitten at first glance, Taiyou boldly confesses his feelings to her. Surprisingly, she reciprocates but vanishes without revealing her identity. To Taiyou's amazement, she happens to be his classmate. Sensing a fateful connection, Taiyou is puzzled when, the following day, she fails to recognize him. How could she forget...?