It's a collaborative reasoning game where two or more players can play.
It is divided into one owner of SNS and other players, but everyone has the same goal.
In the quiet dawn, the main character(owner) who just broke up with his lover is trying to delete an SNS photo album containing memories with him/her.
I deleted it by leaving a hashtag, but I couldn't erase the most precious memory.
Other players follow the adjective hashtag left by the owner of SNS, and flip picture tiles that are the most distant from the feeling the hashtag gives. If the last picture tile after the fifth round was the most precious memory, everyone won. If you overturned the most precious memory during the round, everyone lost immediately.
Leave only one precious memory.