The lead characters from C’s Ware’s hentai games grew tired of constantly
being forced to act in pornographic scenes. They joined forces and created an
artificial realm called the “C’s Ware Land”. They also swore that no hentai
player shall ever use them again for their dubious purposes. However, two
characters that never made it to any C’s Ware game – the boy Pao and the girl
Pino – decided to venture into the dangerous land and defeat the former
protagonists.

Kotobuki is a puzzle arcade game with similarities to Lode Runner and
billiard games. The players can choose to control either Pao (for harder
difficulty) or Pino. The game is divided into sections, each dedicated to a
particular C’s Ware game and composed of several stages. The seven games
featured are Fatal Relations, Love Potion, Xenon, Desire, Amy’s Fantasies, Eve
Burst Error and Gloria.

Top-down stages are populated by recurrent enemies which must be defeated by
hitting them with billiard balls. Pao and Pino are armed with queues and have
to hit the cueball in such a way that a billiard ball with the highest
possible number will hit the enemy. They can also defend themselves by
standing behind balls, and dig holes in the ground to trap enemies. After
completing a regular stage the player faces a boss character.