Episodes
12 episodes · 2025
For high schooler Akiteru Ooboshi, the whole youthful experience thing—like fun, friendships, and even having a girlfriend—is a complete waste of time. So when his best friend’s sister, Iroha Kohinata, keeps teasing him, Akiteru naturally finds it annoying. She practically lives in his room, she’s always on his bed, she’s just a raging storm of clinginess! Why is she only annoying around him?! (Source: Crunchyroll)
E01My Friend's Little Sister Has It In for Me
★9Akiteru just wants to work toward his future, but his friend's little sister won't allow him any peace.
E02The Cousin I Haven't Seen in Years Is Cold to Me
★9Now that Mashiro has moved to his school, can Akiteru manage to make her open up to him?
E03Only I Can Be a Pain to My Uncle’s Daughter
★10Akiteru decides to throw a welcome party for Mashiro, but first he must convince her to attend.
E04My Friend's Little Sister Might Be a Delinquent
★10Akiteru and Iroha recall how they first met.
E05My Friend's Little Sister Keeps Getting Close to Me
★9A look back at how Iroha came to be the voice actress for 05th Floor Alliance.
E06My Friend's Little Sister Has It In for My Friend's Enemy
★10While at the mall with Mashiro and Iroha, Akiteru learns why Mashiro left her old school.
E07The Girl Who Confessed to Me Is Cold to Me in Reality
★10Akiteru tries to give a proper reply to Mashiro's love confession, but she's brutally cold to him in person.
E08Everyone I Know Is Being Weird With Me
★10Sumire asks Akiteru for help with a problem that could endanger her future with 05th Floor Alliance.
E09My Fake Girlfriend Gets Tough When I Respond To Her Confession
★10Akiteru and Iroha head to Otoi's studio to record for the game, but Iroha has ideas of her own.
E10My Friend's Little Sister Only Gets an Apology from Me
★10Akiteru must clear the air with Iroha to keep 05th Floor Alliance running smoothly.
E11We're Perfect for Training the Drama Club
★10With 05th Floor Alliance's help, the drama club is ready for the big competition... but then disaster strikes.
E12My Friend's Little Sister Really Does Have It In for Me
★10Can Akiteru save the drama club and secure 05th Floor Alliance's future?