My Years After Transmigrating to Demon Slayer

[System + Hot-Blooded + Fun and Games + Demon Slayer + Multiverse]

Straightforward synopsis: Transmigrated into the world of Demon Slayer.

Our protagonist, Wang Er, awakens a System that gives him one random item from across the myriad worlds every day. When he sees the Coca-Cola he gets on day one, he says, “The hell? What use is this thing to me? I'm about to get eaten by a demon, and this is gonna make me choke. What, am I supposed to pair it with a sweet drink? Wait, this lousy thing says there's no pity system and it's all luck? Damn it. What am I supposed to do, a guy who pulls on gacha and gets nothing but dupes? How am I supposed to live? I *** you ***,” followed by a stream of colorful curses.

I'm a new author, and this is my first work. I'll do my best to take your feedback on board, but please don't flame me if it's not to your taste.

[Some details of the setting have been changed.]