おーばーふろぉ

Synopsis:
"Brother, are we really taking a bath together?"
And so, a forbidden bathing experience began. Me, my sister, and childhood friend—one man and two women—are sharing one bath. After involuntarily "overflowing," the sister's secret love come out?!

This is a young romantic comedy that won't let you say, "it's over!"
(Source: Official site)

https://overflow.cf-anime.com/

MAL: https://myanimelist.net/anime/40746/Overflow
AniList: https://anilist.co/anime/113417/Overflow/