Majotori
Majotori is a collection of stories with which you'll interact by playing quizzes. A witch appears to various characters after they make a wish, and offers to make it come true if they play a quiz game with her. Majotori's carefully compiled selection of questions covers all sorts of topics, but focuses on video games, cinema and animation.
Story
Sometimes when someone makes a wish, the witch Lariat appears and challenges them to a trivia game. If they win, she makes the wish come true, but if they lose, something bad might happen instead.