Last Waltz: Hakudaku Mamire no Natsu Gasshuku

A summer baseball training camp on an isolated island sounds about as ordinary as it gets — until a civil war breaks out on the mainland and the adult supervisors sail off to investigate, never to return. That's the setup for Last Waltz: Hakudaku Mamire no Natsu Gasshuku, a 2-episode OVA from 2010 based on a visual novel. Yuki Mochizuki is the baseball club caretaker left behind with the rest of the stranded group, including teammates Maya, Miyako, and Hinako. No adults. No supplies. No rescue in sight. As days stretch on and resources dry up, the atmosphere shifts from uneasy to genuinely foreboding, and the characters start making choices that reflect how quickly people unravel when structure disappears. The show leans into that psychological deterioration — watching the group dynamic fracture under pressure is where the tension actually lives. Don't expect a slow burn thriller that stays tasteful; this is hentai, and it goes where you'd expect given the premise and studio. If you've watched Wana: Hakudaku Mamire no Houkago or Helter Skelter: Hakudaku no Mura and appreciated how those titles build a suffocating atmosphere before things escalate, this one operates in similar territory. The survival framing gives it more narrative grounding than most entries in the genre, which makes the descent feel earned rather than abrupt. Short runtime, specific audience.