For high schooler Akiteru Oboshi, 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?!
E1
Akiteru just wants to work toward his future, but his friend's little sister won't allow him any peace.
E2
Now that Mashiro has moved to his school, can Akiteru manage to make her open up to him?
E3
Akiteru decides to throw a welcome party for Mashiro, but first he must convince her to attend.
E4
Akiteru and Iroha recall how they first met.
E5
A look back at how Iroha came to be the voice actress for 05th Floor Alliance.
E6
While at the mall with Mashiro and Iroha, Akiteru learns why Mashiro left her old school.
E7
Akiteru tries to give a proper reply to Mashiro's love confession, but she's brutally cold to him in person.
E8
Sumire asks Akiteru for help with a problem that could endanger her future with 05th Floor Alliance.
E9
E10
Akiteru must clear the air with Iroha to keep 05th Floor Alliance running smoothly.
E11
With 05th Floor Alliance's help, the drama club is ready for the big competition... but then disaster strikes.
E12
Can Akiteru save the drama club and secure 05th Floor Alliance's future?