Catarina Claes, the young daughter of a noble family, one day bumps her head and regains memories of her past life as an otaku. It is then that she realizes she has been reborn into the world of the otome game Fortune Lover, reincarnated as the game's villainess who, regardless of what route the player took in the original game, is doomed to be either exiled or killed. In order to avoid these routes that lead to doom, Catarina begins taking countermeasures. This, however, ends up having unexpected consequences on her relations with the other characters of the game's world.

Third season of Osomatsu-san.

My childhood friend Shida Kuroha seems to have feelings for me. She lives next door, and is small and cute. With an outgoing character, she's the caring Onee-san type, this being one of her greatest strengths. ...But, I already have my first love, the beautiful idol of our school, and the award-winning author, Kachi Shirokusa! Thinking about it rationally, I should have no chances with her, but, while walking home from school, she only talks to me, with a smile even! I might actually have a chance, don't you think?! Or so I thought, but then I heard that Shirokusa already has a boyfriend, and my life took a turn for the worse. I want to die. Why is it not me?! Even though she was my first love... As I was drowning in despair and depression, Kuroha whispered. —If it's that tough for you, then how about we get revenge? The best revenge ever, that is~ (Source: Novel Updates, edited)

Despite his noble title, Noir Starga is at the bottom of the social hierarchy. Because of this, his fellow nobles oppress him and treat him like garbage. However, he possesses a rare yet powerful ability to communicate with the Great Sage, an oracle who grants Noir the answer to absolutely anything. After failing to secure a job as a librarian, Noir decides to join the Hero Academy. He knows he must become stronger to enter the institution. The Great Sage advises him to explore a hidden dungeon deep within the mountains. There, Noir meets Olivia Servant, a beautiful yet enchained maiden trapped within the labyrinth. Olivia bestows upon Noir a set of ridiculously powerful skills that grants him virtually total control over reality. Naturally, there is a catch—every time Noir attempts to use his powers, his life points decrease, putting his life at risk. To replenish his energy, he must give in to worldly pleasures such as kissing his childhood friend! With his newfound powers, Noir begins his journey as a student in the Hero Academy, meeting new acquaintances and helping them through the dire situations ahead. [Written by MAL Rewrite]