The hero, who was on the verge of university entrance exams, paid no heed to his parents and spent all his time playing around. One day, a tutor named Yotsuba arrived at his place. Yotsuba calmly began teaching him, but the hero rebelled against her. Amidst this, Yotsuba made an unexpected proposal: if he studied hard, she would reward him with a kiss. Initially, the hero thought it was a joke, but seeing Yotsuba's serious demeanor…
