Akashic Records ～櫻の戦箱～

The tiny island was shrouded in white mist.
Its existence was known to precious few, its location hidden.
On the island there was a vast store of information...

... the Akashic Records.

Kousuke Mizuhara was on a long school trip one spring. On the last day of sightseeing he was on a ferry which, instead of taking him to the mainland, was enveloped in white mist. He and the other students arrived somewhere... and were greeted by a beautiful young girl.

"Welcome everyone, to Kokujima."

A mystery novel game.

(from dlsite.com)