For the past 13 years, the Nefarious Monster Army have appeared beneath their floating fortress every Sunday to advance their goal of conquering Earth. Luckily, the Dragon Keepers are here to save the day! Having defeated the majority of the monsters during their initial invasion, the heroes now routinely show up to clear away any remnants of resistance. Unbeknownst to the public, however, every fight beyond the first has been a deliberate show put on by both sides: the Dragon Keepers reap the fame and prestige from fighting imaginary enemies, while the surviving weakest monsters, altogether called Dusters, are allowed to live for another day. Sentouin D, a Duster tired of living this life of shame, leaves the fortress in an attempt to overturn his fate. With the unexpected help of the mysterious ranger Yumeko Suzukiri, he discovers the key to defeating the Dragon Keepers lies in their Divine Artifacts—ultimate weapons crucial to the rangers' transformation and unique powers. Teaming up with Suzukiri to infiltrate the garrison of Red Keeper Sousei Akabane, Sentouin D must defy all expectations to save his species from the cruel hands of humans.

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.