Ep 7. I Learned Something Amazing. I'll Hide Myself Before I can be Erased

After the intense battle with the "Three Great Beauties," Souta and his friends return to their dorm only to find out that they have to clean it up. While they clean, Nanami discovers a hidden room and as they explore, they come across an odd device with instructions on how to use it. Souta and the others start fiddling with it and soon find out that it has the ability to erase memories.

As they continue to experiment with the device, Souta suddenly disappears. The device had accidentally erased his memories and the others begin to panic. They enlist the help of the school nurse and Souta's roommates to find him, but they're unable to find any clues.

Meanwhile, Souta finds himself wandering around aimlessly with no idea who he is or where he's going. He stumbles upon a group of people who mistake him for someone else and soon realizes that he has a new identity and a new life. He tries to make sense of these new memories and falls into a deep depression when he can't reconcile them with his old life.

As the others continue to search for Souta, they come across a clue that leads them to a hidden facility deep within the school. There, they find Souta trapped in a room and learn that the facility is responsible for erasing people's memories and giving them new ones. They fight their way through the facility and manage to extract Souta, but not before they learn something shocking about Souta's past.

The episode ends with Souta and the others back in their dorm room, as Souta comes to terms with the shocking revelation about his past. The device which they accidentally used to erase his memories was created by the mysterious organization that has been trying to capture him for some time. They realize that Souta's memories are not the only things at stake and that they must be vigilant if they are to stay ahead of those who seek to capture them.