A real-life Manga adventure follows two cute Japanese boys who discover what a single night in Shinjuku holds for unwary lovers. It's the night of Gacchan's birthday and boyfriend Takayuki is waiting at home to celebrate. But Gacchan has not only forgotten about his party, he's been out playing around. Furious, Takayuki leaves, threatening not to return until he's indulged in some adultery of his own. Takayuki has run-ins with an assortment of strange characters, going from one dodgy situation to the next as Gacchan secretly interferes. But then Takayuki meets Keiichi, a stranger with a soft smile. Gacchan is furious with jealousy, but he eventually loses track of the two boys and must leave them alone in Shinjuku's neon night.