Eiko is pushing thirty, but has never once had a boyfriend. She's always been fully content with living the single life and immersing herself in her passion for video games…that is, until she met Koigakubo-kun, her extroverted younger coworker who's got a silver tongue. After a night of drunken connection, he ends up becoming her romance guru! But as their lessons progress, they start to fall for each other. Koigakubo-kun professes his feelings for her, and before she knows it, they're a couple. After becoming a “real couple” both in body and soul, their next milestone is celebrating Koigakubo-kun's birthday together! As she goes hunting for a present and frets over what her normie boyfriend might like, Eiko runs into none other than his childhood friend!