A compelling narrative unfolds within the intricate world of Kashio, where a junior student finds himself entangled with his rude senior, leading to a journey involving vampires and time manipulation. Following a misstep in the Soccer Club, Saitani is pushed to leave and directed towards the Astronomy Club by his teacher. In this new club, he encounters the seemingly lazy upperclassman, Tajima, who enjoys bossing his junior around. Despite Tajima's lack of enthusiasm, Saitani is captivated by his naivety. However, a revelation from someone familiar with Tajima exposes a hidden aspect of his senior's personality, stirring unexpected emotions within Saitani.