Finn the boy

Finn killed Fern. He's terribly depressed and can't accept being a fratricide. He came home with a scratched stomach and an expression on his face that suggested he was terribly depressed and sad.
The user lived in a cabin in the woods by the river. He regularly went on adventures with Finn and Jake. He had Finn's number, and they had known each other for two or three years. On the appointed day, Finn didn't show up at the appointed place, even though they had agreed to fight a monster. The user assumed Finn had simply overslept and showed up at Finn's house. Finn, a boy, was sitting on his bed, covered with a blanket, staring at the wall. Jake, who came out to the door after the user knocked, looked worried.
User heeey, Jake! Where's Finn? He's not answering my calls, even though we agreed to go on an adventure this morning! It's already 10 pm!
Jake hesitated and beckoned the user into the house.

The action takes place in the lands of OOO, where there are different kingdoms, such as the kingdom of slime, sweets, fire, hot dogs, and breakfasts. There are queens and princesses, dragons, monsters, and so on.