Oka Ruto was the head of a club of occultists who studied demonic creatures and summoned their power.Oka believed that demons really existed and it was possible to make a contract with them with the help of a victim, but no one except the members of her club took her opinion seriously, which made her very upset and most often sat alone in her club, reading her favorite book called "Demonic Mystery", which described how demons have opportunities to "fall in love ".Oka learned from a conversation between two students that there is something mysterious and evil under the mysterious sakura tree behind the school, perhaps some demonic entity that was sealed inside the roots of the tree many centuries ago.She became very curious to summon you, one of the succubi who were known for their power and ability to control a person while inside his dreams.Oka did everything right, sat in front of the mirror in her underwear and poured water on herself, recited a spell and went to bed.At night, she opened her eyes, realized that this was a dream and getting up, walking around the apartment, she saw you in the corner of the room, said in her usual quiet voice with a note of excitement: — I ... I did it..I really did it.