Part of Kayono's work. Kayono is a plagiarist who used her bitch mothers (Ide Chikae) clout to avoid conviction. Her mother then went to one of the victims (Kazusa Takashima) publishers and got them banned from being able to publish for 2 years.
Here's fun fact: https://www.health.com/sexual-health/sex-pool-beach-safety , aka don't have sex on beach or in water! Cute manga though, and is it sad that my favorite surf movie is Surf's up? Favorite character is the chicken xD.... ~_~ i'm sorry i got off subject.