Chara CC is a trainer game. After undergoing an operation, you get a special ability. Whenever you feel pleasure, you absorb CO2 from the atmosphere. Seeing all the damage caused by CO2, it's in everyone's best interest that you feel as much pleasure as possible. To ensure this goal, instead of getting a harem of professionals, you decide to become a teacher at the girls-only Chara Campus. Will you be able to sensitize the students to the catastrophe that is CO2? Will you get close enough to them so that they'll accept to do as much as possible to pleasure you to remove as much CO2 as possible?

It's a massive challenge but you'll eventually get there, little by little. Each day is in three phases : 

in the morning, you teach them about ecology

in the afternoon, you bond with them

in the evening, you call them to your mansion so that they help you capture CO2

The game has over 400 pictures to unlock and to enjoy again in the gallery. The CC in "Chara CC" stands for "Carbon Capture". If you guessed it first when reading the title, well congratulations, you're... special I guess.