Peach Mermaid Vol. 1 (Kodansha, 2018)

"Highly recommended by Ruri Miyahara, the creator of The Kawai Complex Guide to Manors and Hostel Behavior and Love Lab! Rune, an “ex” mermaid, has come out from the ocean to be with the human she's been pining for, Riku, her first love. But as fate would have it, she finds out that she'll never be able to become one with a human…?! This is the first volume of a sexy, yet pure, romantic comedy that's a bit risqué, and sure to make you laugh out loud!