Jun’ichi Nagase and the rest of the cast are invited for a summer vacation.
The OVA shifts the focus from the main series' school setting to a private, luxury island owned by the Ayanokouji family. Akaneiro ni Somaru Saka: Hardcore
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 Jun’ichi Nagase and the rest of the cast
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 While the title might suggest something more explicit,
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