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Iroha, a high school girl with no romantic experience, begins dating Haruki Kusakabe, a seemingly gentle classmate who hides his seasoned charm. Despite his soft appearance, Haruki effortlessly holds hands and steals kisses, revealing his skill as a seasoned romantic. Iroha is swept into her dreamlike first love, thrilled by his affection. However, Haruki openly admits to having an intensely possessive side, which casts a shadow over their budding relationship. As they navigate school life, Iroha grapples with Haruki’s overwhelming devotion and her own feelings, setting the stage for a rollercoaster of emotions.