Kogure Yuuta confesses to Ebina-senpai. This is the story of their relationship.

From Kirei Cake:

Iride Akatsuki is a popular game footage uploader. He wakes up one day to find that he's been kidnapped and taken to a strange place, along with a number of other uploaders who specialize in different genres of games.

A mysterious alpaca-headed host gathers them after the initial stage, to explain how the game will proceed. Will the group of gamers clear the game and make it back to their real lives?

An anthology of stories by various authors:

1) Illusion Summers by Aki Arata
2) Summer Festival by Osora
3) Black Horror Memory by Satou Toshio
4) Stranded Days. by Ayane Shikihito
5) Kisaragi ☆ Summer Project by Komesuke
6) Start the Festival! by Ooshima Renmei
7) With a Clear Mind, Even Fires Will Cool by Sada Uoji
8) Your Voice and Soda Ice Cream by Itokichi
9) Flowing Noodles Warning by Toudzuki Youko
10) A Common Summer Story at the Beach by Tanaka Strike
11) Perfect Weather for Laundry by Peco
12) Konoha, Summer, and I (Physics) by Ryuuseee
13) Mekakushi Summer Vacation! by Wannyanpuu