Hotaru Hinase has lived nearly sixteen years without romance. She is satisfied alone as long as she can enjoy the little things in life with her beloved friends and family. In her mind, she is not meant to fall in love, nor does she understand the concept. While out with a friend, Hotaru witnesses the severe breakup of her schoolmate Hananoi, to whom she has never spoken. Afterward, she sees him sitting in the snow and holds her umbrella over him. To her surprise, this gesture results in him confessing his feelings for her at school the next day. Though Hotaru rejects him, Hananoi insists on letting her get to know him. He does whatever he can to woo her, from changing his hairstyle to finding her lost hairpin in the snow. Although she has no romantic feelings towards him, Hotaru believes that by spending more time with him, she will learn how to love. She agrees to date him and slowly begins to navigate what being a girlfriend entails, including how to reciprocate the kind gestures that Hananoi continues to perform for her.

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From an early age, Haruka Sakura was made an outcast due to his unconventional appearance and lack of social skills. However, the rough treatment turned him into a proficient fighter, which is now the only thing he prides himself on. Starting at Furin High School, where it is rumored that strength is valued over academics, Sakura has only one goal—taking the top spot. Involved in a street brawl the day before his enrollment, Sakura happens to meet a group of his future schoolmates. Instead of the usual rejection, they fight alongside him, demonstrating that what the school actually cares about is protecting the town of Makochi from any harm—hence why the students call themselves "Bofurin." Surprised by the support and appreciation of the townspeople, Sakura has a hard time accepting their goodwill. Though unfamiliar with kindness being shown to him, Sakura must learn to push past his discomfort when Bofurin is pitted against formidable enemies. After experiencing the feeling of acceptance, he finds himself fighting for the sake of others for the first time.

High school student Taiyou Asano has been socially inept ever since his family died in a car crash. The only person he can properly interact with is his childhood friend, Mutsumi Yozakura—the head of the world's strongest family of spies. Mutsumi's eldest brother, Kyouichirou Yozakura, has been overprotective of her ever since he once rendered her severely injured. His love for Mutsumi is lethal, and Taiyou is his next target. To survive, Taiyou must marry Mutsumi and become a member of the Yozakura family. Thrown headfirst into chaos, Taiyou begins his journey to become a powerful spy in order to protect his wife and uncover the dark secrets of his past and the Yozakura family.