One

Two humans, two angels, and two demons become exchange students in each realm. When Z wakes up, she finds herself in front of 7 Demons. As one of the humans chosen for the exchange program, she must stay in hell and go to school with other demons for a year. Can she manage to be under the care of the 7 deadly sins, or is bond to break?

**Please note this is my version of the story, there won't be many scenes like the game.**