The protagonist Takayuki (default name, can be changed) is working as a home tutor for various children. It's all rather casual at first, but when his students start wanting more of a "reward" when they do well... Short quiz-game segments that determine how well you've managed to teach your pupil. You can choose at the very beginning who you want to teach, but later on in the game you have to work with more than one student each month.