Kenshin had just wanted to reconstruct an old Sword Style. Now he was stuck in a game. A deadly game on top of that. He'd better learn fast if he wants to get out. Luckily he isn't the only one fighting for their freedom. They wouldn't stand a chance otherwise, no matter how well the System supports the Hiten Mitsurugi. Summary might change.
Dumbledore trusted the Dursleys but McGonagall didn't, so she tracked down some other non-magical relatives. More distant relatives, and seemingly friendlier. Funny how a bout of accidental magic can change the fate of a clan. Now the remaining Uchiha must hide their fire until they're ready to rise from the ashes. Which happens to be easier when you have a wizard in the family.
No one had wanted to know. No one had wanted to see. But just because no one recognized the blade it didn't mean it wasn't there. Battousai had always been the name of a weapon.