Thirty-year-old manicurist Toshi Agawa is a devoted fan of the idol group FLAT. For the first time in two years, he’s finally going to see them live, together with his new friend “Kazusa,” a fellow fan he met online who managed to snag them tickets to the upcoming concert. It’s the perfect match — not only does Kazusa share the same intense love for FLAT, but they both stan the same idol! However, when Toshi arrives, the man waiting to meet him looks less like a fan and more like a yakuza thug! Will he still survive the night and have fun?