Afterlife — A visual novel takes place in the afterlife, be it based on an existing mythological concept (such as heaven and hell in Abrahamic religions or Purgatory in Catholicism) or not. The afterlife is the concept of a realm, or the realm itself (whether physical or transcendental), in which an essential part of an individual's identity or consciousness continues to exist after the death of the body in.
All Just a Dream — The majority of this visual novel's events were hallucinated/dreamed up by a character in-universe. In extreme cases, the game reveals at the very end that all the characters whose stories the player has been following up to this point are nothing more than a figment of another character's imagination.
All the Way Through — This game features at least one scene where the tentacle goes all the way through the whole gastrointestinal tract, entering the anus and emerging from the mouth (or vice versa).
All-boys School — This game is set on a school that only admits boys as students.
All-girls School — This game is set on a school that only admits girls as students.