 If you liked Code Geass: Hangyaku no Lelouch |  ...then you might like Lost+Brain |
They both have main characters who try to control people and society through suggestions and orders (Lost+Brain by Hypnotism Code Geass by Geass) and both want to make society a better/more ideal place
You can change the will of other people, you can manipulate them to do anything you want them to do. What would you do? Would you use this power to your own advantage or would you try to make the world a better place? Bioth main characters of these series have different motives, that's why if you read one these stories the other one will make you rethink about what you could do with such an ability.