The protagonist moves into his late grandfather’s house after starting high school.

One day, a dungeon appears in the mountains behind his home—but it only spawns slimes.

He begins defeating them and collecting magic stones, but quickly learns that only registered explorers can sell them through the Adventurer’s Guild. With no other choice, he registers as an explorer.

Thus begins his new life: balancing high school, solo living, and earning pocket change by hunting slimes in his backyard dungeon.

Note: Chapters are short, as per the author intention so that the reader may read little at a time.