A side-story providing an alternative retelling of the events of the anime as well as original stories.

I have a girlfriend, her name is Shiori Hoshino. She is known as the “Ice Emperor” because of her overwhelming appearance and cold personality. And surprisingly, she is an anime fan, and also considers herself an otaku. But in reality she hides a secret, and that is that she has a phobia of men. Although for some strange reason, she usually feels at ease with me. But, there is something that I have not been completely honest with her about. And that is that I maintain a secret relationship with my stepsister. Although, it’s not infidelity if it’s with her, right? Source: NU

Nonokawa Riku had to leave college after the shut down of her father's company, and working as a bartender. One day, Riku's skill of design was found by a director, and here began her new life...

During the day - a first year high schooler bishoujo. After school - A little sister who only spoils me!? 「Become a rental onii-chan so we can write a little sister type character」- that was the mysterious part time mission given by a game company. Furthermore the client said: 「If you become a little sister, Majima will give you lots of love, won't he?」 At first she was only a bishoujo classmate but now all of a sudden she started acting sweet and our distance became closer!? (Source: Fantasia Bunko, translated)