The series begins with Rin Tsuchimi and Kaede Fuyou having their breakfast. On their way to Verbena Academy, they encounter a man belonging to Kaede's fan club, who is easily defeated. At Verbena Academy, Rin meets up with his friend Asa Shigure. During a discussion with classmates Itsuki Midoriba and Mayumi Thyme, Rin and Kaede learn about a rumor that a new transfer student is arriving to Verbena. After Rin finishes a lecture with Nadeshiko Benibara, she warns Rin about his evasiveness but tells him to not lose his willpower. Meanwhile, Mayumi informs the whole class that there are two female transfer students. While shopping a grocery store after school, Rin encounters a red-haired god named Lisianthus, and helps her get two packages of meat for a friend. Later, Rin encounters a blue-haired demon named Nerine singing on a swing and is impressed by her voice. The next day, Lisianthus and Nerine enter Benibara's classroom. Their parents Eustoma and Forbesii, who are respectively the kings of the gods and the demons, also arrive and introduce themselves. The kings informs Rin that he has been selected to marry either one at his own accord and that they have become Rin and Kaede's next-door neighbors.