Yonimo Kimyou na Supermarket

There's a little sickness in everyday life, right? "Yonimo Kimyou na Supermarket" is a mysterious shop that can only be visited by people who have a feeling of sickness in their hearts. The item chosen by Kobayashi, the store manager who is not a human being, is "it's up to you what happens when you use it." What is the fate of the characters who used the items?