During his sophomore year in high school, the main character, Yuushin Tahara, discovers that his childhood friend Miyu Fukagawa has returned to live next door after moving away. Although Miyu is now adorable, there is something peculiar about her behavior. This is an exciting romantic comedy that follows the journey of the sweet-natured protagonist as he navigates his feelings for Miyu and her quirky personality, along with their friends and the thrilling escapades they encounter together.