Within everyone there exists a side preferably kept hidden, even from close friends. For the smart and popular Kyouko Hori, it's the fact that she has to do all the housework and care for her little brother, Souta, because of her parents' busy work schedules. For the gentle Izumi Miyamura, whom everybody sees as an otaku, it's his nine hidden piercings and large body tattoo. So what happens when they accidentally discover each other's hidden sides? Sharing parts of themselves that they couldn't with anyone else, strong bonds of friendship soon begin to form between Miyamura and Hori, as well as those around them. As their hidden personas start to dissipate, they slowly learn how to open up to others.

One normal school day, Rikka Takanashi notices Makoto Isshiki secretly passing a flash drive to Yuuta Togashi. Curious, Rikka talks to her friends about the case, who agree that Yuuta is hiding something from her. They decide to discover the contents of the flash drive by any means necessary, but to their surprise, it merely contained pictures of an idol that Yuuta adored back in middle school. However, Rikka takes offense, as she claims that this breaks their contract as lovers and demands Yuuta to return the flash drive. Although having seen Yuuta return the flash drive, she still felt uncertain about the situation. This leads to her sneaking into Yuuta's room during the night, only to find out that the flash drive had not been returned! Scanning through its contents, she hurriedly rushes to bed when Yuuta enters her room. To her terror, she finds the flash drive crushed due to her negligence in keeping it in a safe place. Yuuta quickly finds out and demands an apology. However, Rikka too, demands an apology from him, resulting in both of them refusing to be the one to apologize first. Will the two lovebirds be able to resolve their argument?

Syaoran, Sakura, Kurogane, Fai and Mokona's journey through to different world's continue as they search for Sakura's feathers. The fated journey slowly becomes more complicated for our travelers, as they find themselves diving deeper into more dangerous worlds.

Five years ago, alien beings known as the Kiseichuu'' invaded the world. With the species endangered, the Kiseichuu are determined to take over Earth through a deadly plan that would gradually wipe out the human race: take away humanity's sexual drive using various methods, letting them die out. In response to the Kiseichuus' scheme, the HxEros device was developed—a powerful weapon that only those with high levels of erotic energy can utilize at its maximum capacity. Retto Enjou, a high schooler harboring an immense hatred toward the Kiseichuu, joins a group of HxEros users to fight against them and protect humankind. With their gear reliant on erotic energy as a source of power, the team must work together to maintain high levels of libido to ensure their readiness for combat at any given time. Moreover, as he lives in a house full of lustful girls, Enjou should not expect a shortage of power anytime soon.