The series is often categorized within the (Netorare) subgenre of adult media, which focuses on themes of infidelity and the emotional or psychological impact on the original partner. You can find more information about its reception and reviews on MyAnimeList or IMDb .
As Yuuya hides Yoru in his apartment, a series of erotic and emotional encounters unfold. But a shadowy organization known as hunts Yoru, claiming she is a bio-engineered "Solar Dependent Mutant" (SDM)—a failed experiment from a secret government project to create solar-powered soldiers. The twist: Yoru is actually a clone of the original Himawari, created using sunflower DNA. She was discarded because she can only thrive in darkness. himawari wa yoru ni saku ova sunflower ha yoru hot