My Friend's Little Sister Has It In for Me! - S01

Akiteru Ooboshi lives by a single rule: efficiency above all. He works as the producer of the 05th Floor Alliance, a small game development circle made up of his fellow apartment tenants. When their latest title, The Night the Black Goat Screamed, unexpectedly passes a million downloads, Akiteru decides to approach Honeyplace Works, a major company run by his uncle, Makoto Tsukinomori, hoping to secure the circle's future and push their next projects toward even bigger success. But his uncle has an unusual condition before agreeing to the partnership: Akiteru has to pretend to be the boyfriend of his cousin, Mashiro. Since it seems like the most efficient solution, Akiteru agrees for the sake of his team. Then there is Iroha Kohinata, the younger sister of his fellow developer and best friend, Ozuma. A relentless tease, Iroha takes particular pleasure in throwing Akiteru off balance. As the lines between work, school, and his personal life start to blur, Akiteru ends up caught between two girls who might just decide his entire future.