The Incident Where the First Weapon I Obtained After Being Reincarnated in Another World Was the Strongest

I suddenly found myself in another world!! Well, it's generally your typical otherworld reincarnation story. As for a harem... there's a pretty good chance of that. I mean, the protagonist is a boy after all! As for being overpowered... it's about fifty-fifty. That's the kind of feeling I'm going for! I don't think I need a long preamble. In any case, if you're interested, I'd be happy if you'd read the first chapter!