The Tragic Cheat System Helps the Black-Haired Grump Online

After Cha Mu boards the shady ship, he enthusiastically clinks glasses and drinks with everyone. But while the others are drinking real liquor, he alone gets drunk on fake booze.

The result? While everyone else parties, he cooks. While everyone else goes about their lives, he loops through the same day. After repeating it so many times he's about to throw up, Cha Mu hurls his iron wok into the sea and transforms into an encrypted Zuanese broadcasting machine!

Cha Mu: Cook ***** meals!

But before the wok has been gone for three seconds, someone throws it back up onto the ship?

The devil, with a face like this: →_→ So you're the one who wants to sign a magical contract, right?

Cha Mu: OAO ?! ... ?Q_Q?

To escape his endless time loop, Cha Mu eventually chooses to travel to different worlds and complete missions. As long as he gets all the designated characters to their happy endings, he can stop being a wage slave and enjoy a peaceful retirement! What's more, that lousy devil gives him all kinds of cheat codes in every world: save points, forums, secret identities, livestream comments, and more!

Cha Mu: A happy ending? Easy peasy.

[But what awaits him is an abyss of bad endings!]

I haven't figured out all the worlds yet. Think of them as different levels mixing all kinds of elements? (Let me work on the blurb some more.) Roughly, there'll be:

Rewind to a strange save point + an alternate timeline where Boss Akutagawa doesn't defect

A food forum that suddenly changes tone + a fast-paced volleyball and Hakone sports anime crossover

Murderous livestream comments? + The snowy forest opening of Demon Slayer, with Giyu standing still

Multiple secret identities + Public Security Devil Hunters and a tangled love-hate relationship with the Vongola?

A White-aligned faction barging into Akai's undercover life?

In short, it's a variety of bad endings for a bunch of black-haired, sour-faced characters, and the protagonist's painfully chaotic attempts to save them. (There really are all kinds of black-haired, sour-faced characters, lots of jokes, and plenty of people.)

Theme: Among countless endings, there will always be a happy ending filled with love for you