The System Forces the Police Academy Squad to Forget Everything After Binding

When a mage is having a great time killing time at the police academy, then suddenly picks up a forum system... Mage (remembering through the forum their past life in the real world before transmigrating, and realizing they’re so tangled up with the police academy’s five-man group that they can’t pull themselves away, staring into space): System, do you think I should figure out a way to keep all four of these guys from getting killed? I just can’t imagine seeing them as gray-and-white photos. System (perfectly calm): No problem at all! Do whatever you like. Mage (thinking seriously): First, I’ll take on every dangerous job they might have to handle. After all, I’m not afraid of danger. So I should make them forget I ever existed first. Maybe I should try what Hermione did? Something like Obliviate. System (immediately losing its composure): What?! 1. The protagonist transmigrated here from the real world. 2. They used to think this was the world of Hogwarts. They joined the Chosen Three and killed the Faceless Man with the Killing Curse, then, just as they retired to the real world to live an ordinary life, they met the real-world police academy’s five-man group. 3. After spending a while having fun with them and becoming close friends, they picked up a forum system and discovered that this world seemed to be a crossover with the Detective Conan world too. 4. In the end, the protagonist decides to save them from their fates, using a precision version of Obliviate to erase the memories of them from the police academy’s five-man group, their instructors, and everyone else who knew them. 5. This story covers what happens before, during, and after that. 6. Finally, this is my first time writing this, so please go easy on me about the out-of-character moments. (All in all, I already paid for this book cover. My friend nagged me to come and add a sentence.) Theme: To protect their close friends and save them from their fates, the protagonist uses a precision version of Obliviate on everyone who knows the truth.