Working himself to the bone for his sick family, Nao Tsurugi is a struggling salesman. Due to his overly honest nature, his sales numbers are dismal, and his misfortunes culminate one day when he is stabbed to death by an enraged customer while on the job.

When he opens his eyes, he finds himself in a mysterious amusement park where only those who have died are gathered.

[Clear the quest and you may return to the real world.]

The condition for clearing the game is to defeat a boss monster capable of slaughtering humans in an instant. However, the exclusive weapon granted to Nao is a bottom-tier "1-Star" item.

Though Nao falls into despair, it turns out that this seemingly useless "weapon" harbors a hidden power: the ability to grow infinitely—