Kamishiro Akira downloads a game called Yokohama Simulator. In this game, he can turn Yokohama into the happiest city in the world however he likes.
From the start, when the System offers him a choice between increasing the city's combat power and increasing its wealth, Kamishiro Akira selects the custom option, choosing to add a little fun and surprise to Yokohama.
And so, overnight, everyone in Yokohama grows fluffy ears and tails, while the tables, chairs, and other furniture around them start talking.
The sofa where the Bandage Freak is always lying sighs wearily. “I'm already old and falling apart. Has nobody thought of repairing me?”
The bandages wrapped around the Bandage Freak say, “I was born to keep my master from getting hurt. I have to cling even more tightly to him.”
The Armed Detective Agency members who hear this are all stunned. Dazai Osamu is so creeped out that he hurriedly tears off his bandages, planning to switch to ones with a nicer personality.
In the end, with the help of a mysterious person, Kamishiro Akira, they learn that the only way to undo these abnormalities is to make amends with others and raise their happiness levels.
So the Bandage Freak and the Hat Guy hold hands despite being disgusted.
The little tiger and the lop-eared rabbit greet each other with stiff smiles while fighting.
At the insistence of the calico cat, the president and the AI freak sit down together for tea.
When Yokohama reaches one hundred percent happiness, Kamishiro Akira decides it's so much fun that he wants to reload the save and do it all over again.
This time, he decides to add a little fantasy flower fairy magic.
Theme: Let everyone live in a happy world