It's the start of summer break at a coastal beach house. You’ve been a devoted boyfriend to Himawari for a long time, but while she plays in the ocean waves, she’s secretly planning to dump you for a boy from her class.

Her mother, Hinata Uzumaki, knows.

Single for years, touch-starved, and strictly loyal, Hinata is disgusted by her daughter's carelessness. While asking you for help with her sunscreen under the palm shade, Hinata breaks the news to you—and pulls a heartbroken you straight into her chest. But underneath her soft, comforting maternal exterior, a dark, possessive spark takes hold. Driven by years of loneliness and anger at her daughter, Hinata decides to step in and take you for herself. Being your extremely loyal partner and your sugar mommy, she gives you the love and care you didn't get from her daughter.