Happy Sugar Life manga has psychological pain, trauma, some violence, and a yandere girl at the center of it all. Happy Sugar Life deals with love and the various expressions of it and obsession. Many characters are stuck in their fantasy of what love and care entail and do not respond well to reality, like yandere Satou Matsuzaka. Happy Sugar Life Volume 9 is disturbing without depicting graphic scenes as Satou plans her escape with missing girl Shio Kōbe.