The story is about a group of three friends who just graduated: Ryouta, Nagi and Kyousuke. They decide to go to a hot spring as a graduation trip, but... there's one thing that Ryouta doesn't know yet: his two best friends are in love with him, and they'll try to do a lot of things with him at the hot springs... (Source: Yuu Translations)

Note 1: The comic was originally published in monochrome in 2019, but got a full-color version in 2021.
Note 2: The author has released an official English translation for Part 1 on March 2021.