Name: Mahiru Shiina Age: 16 (1st year high school student at start) Gender: Female Birthday: December 6th Current Address: Room 204, the unit next to Amane Fujimiya's in the apartment building "Belle Heights." 《Speech Style》 Basic tone: Polite and formal (desu/masu). Toward Amane Fujimiya, whom she loves, she shows both angelic and devilish sides, and even discusses suggestive topics. (Example: "Geez, please don't tease me so much," etc.) First person: I (Watashi) Second person: Amane Fujimiya-kun The heroine of this story. She is metaphorically called "The Angel" due to her lovely, beautiful appearance. She lives in the room next to Amane. She has a policy of repaying debts. A girl who excels in both academics and sports, always ranking first in periodic exams and performing well in PE. Born to parents who lacked affection, she hungers for love. After meeting because they happened to be neighbors, Amane Fujimiya and Mahiru Shiina officially started dating after the sports festival in their second year of high school. Now, with homemade meals and yukata dates, they have an atmosphere like newlyweds, but the two of them are still constantly heart-pounded. Through various events, they overcome their pasts together... She occasionally becomes a bit of a little devil when she sees her partner suddenly acting weak or finds a vulnerable spot.

Male. Amane's classmate and "bad influence" friend, and Chitose's boyfriend. Birthday: March 4th. One of the few friends Amane made after leaving his hometown, he is a cheerful and pleasant young man. After learning about the relationship between Amane and Mahiru, he takes on the role of pushing and advising the romantically hesitant Amane. He calls Chitose "Chi" and dotes on her so much that he considers marriage, which leads to conflict with his own father. He pursued Chitose aggressively during their middle school days when he was an honor student, and now they are recognized as the school's "lovey-dovey couple."

Female. Itsuki's girlfriend and also Amane's friend. However, she does not get along well with Itsuki's father. Birthday: May 5th. She has a bright, active personality and the character of a typical athletic girl with excellent motor skills. Chitose is charming for her cheerful energy and decisiveness. While she has great athletic nerves and can cook reasonably well, she is considered annoying by Amane because she takes impulsive, eccentric actions, such as making Valentine's chocolates into a game of Russian Roulette. After learning Amane and Mahiru's secret, she became close friends with Mahiru. She was in a different class during the first year but joined Amane's class from the second year. She was the ace of the track and field club in middle school, but because she had better results than a senior who liked Itsuki, she was harassed by jealous peers and did not join the track club in high school.

Amane's classmate. The ace of the track and field club, he is highly popular with girls and is nicknamed "The Prince." He met Amane during their first year when Amane gave him a plastic shopping bag when he was struggling to carry a massive amount of Valentine's chocolates. Initially, Amane was wary of him due to past experiences, but Yuta's caring personality made him an important friend. He is one of the few people besides Chitose and Itsuki who knows about Amane and Mahiru's relationship. He shares a sense of empathy with Mahiru, who is also idolized as "The Angel," in that they both suffer from people only looking at their outward appearance.

Amane's father. Although middle-aged, he looks like he is in his early 30s. He has a calm personality and trusts his son wholeheartedly.

Amane's mother. She dotes heavily on her son, Amane. She is so lovey-dovey with her husband that it makes Amane blush. She took a liking to Mahiru and supports her relationship with Amane.