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外表帥氣、超受女生歡迎的高中生大輝,其實是個不折不扣的「姐控」。愛姐成癡的他,某天在路上,撞見姐姐竟跟一名外表土氣的男子走在一起!無法接受的他,闖入姐姐的大學,打算叫該男與姐姐分手。但沒想到這位名為神谷的男生,其實只是跟大輝姐姐同個社團的社員。意外之餘,大輝也發現自己與神谷相當意氣相投。越走越近的兩人,心中對彼此漸漸萌生了異樣的情愫。
Flirty, handsome high school student Daiki has one defining trait: his self-professed sister complex. In Daiki's eyes, his beloved big sister Futaba will always be number one and deserves nothing but the very best – so who is this Kamiya guy, and why is he hanging around with her!? Thinking that no way in hell is his sis hooking up with this gloomy dude on his watch, Daiki sneaks into her college and confronts Kamiya. It turns out that Kamiya isn't Futaba's boyfriend, but one thing leads to another, and he becomes Daiki's friend. The more they hang out, the closer they get until Daiki realizes his heart skips a beat whenever Kamiya flushes red.