Oshino-kun is an idol otaku who's devoted to his oshi and his oshi alone. He had planned to spend his high school years supporting his oshi while studying for university entrance exams, hoping to move to Tokyo and finally meet her. However, on his very first day of school, the girl sitting next to him, Tamao, publicly confesses her love for him...!? Despite Tamao's adorable and earnest attempts to win him over every day, can Oshino-kun resist her charms and devote his high school life to his beloved oshi instead?