Synopsis. Everybody goes on vacation to Ayanokouji's private island for fun in the sun. Hilarity ensues. MyAnimeList.net Akaneiro ni Somaru Saka Hardcore OVA - Shinyui
is a single-episode Original Video Animation (OVA) released in 2009 as a follow-up to the 2008 anime series. While the title might suggest something more explicit, it is primarily a fanservice-heavy "beach episode" that leans into the comedy and ecchi roots of the original adult visual novel. Plot and Setting Akaneiro ni Somaru Saka: Hardcore
The "hardcore" aspect comes from a mysterious sunblock introduced to the girls, which causes "unique" and exaggerated reactions, fueling most of the episode's humor and ecchi scenarios. Key Characteristics Akaneiro ni Somaru Saka: Hardcore - MyAnimeList.net Synopsis
The OVA shifts the focus from the main series' school setting to a private, luxury island owned by the Ayanokouji family. MyAnimeList