It is a suspense adventure game dealing with psychological warfare as players are pitted against a cunning and powerful criminal while trapped in the open sea on a cruise ship.

If the wrong selections are made, or an item missed, the story will eventually conclude abruptly with death and game over.

The stage of this tale is set inside the high speed experimental ship Basilisk.

Kyosuke Koduki, the game's protagonist, is invited on the ship's maiden test voyage as a guest by his friend's mother.

!, Tears to Tiara, Kusari and ToHeart2 XRATED) Leaf was forced to release its source code to the public due to having used the Xvid video codec in the game without complying to the software's license.