"The Circumstances in My Home's Bathtub") is a Japanese four-panel manga series written and illustrated by Itokichi.

It has been serialized in Media Factory's Monthly Comic Gene magazine since 2011 and the chapters have collected into eight tankōbon volumes.

[9] The series is directed by Sayo Aoi and written by Yuniko Ayana, with character designs by Koji Haneda.

[11] A 14-episode live-action television series adaptation titled 49 Days With a Merman premiered February 6, 2022 on KKTV Taiwan streaming service.

[12] The series was directed by Hsi-ming Chang, and stars Bruce Hung, Kent Tsai and Liu Chu-Ping.