Anime where mc travels back in time and accidentally says girls real name?

So I saw an anime clip on Instagram reels a while ago but can’t find it in my watch history. It had a guy who traveled back in time then saw his close friend/girlfriend and calls her by her real name. At this point, she has never revealed her real name to anybody before, so she’s very suspicious and angry at him. They’re in a busy area and he can’t get her to calm down so he says some kind of command as if she’s a robot that makes her go unconscious (something like NAME, go to sleep/power down). I believe right before she loses consciousness she says something like “how could you”. I tried asking AI but it was useless.