Birthday: June 22 Gender: Female Age: 15 She is quite sharp-witted, often coming up with ideas accompanied by a 'ping!' sound effect. She also has a habit of biting her finger when deep in thought. She habitually acts cute to calculate and capture men's hearts, and frequently devises schemes to create lewd situations with Rentaro. Even outside of her sexual desires, she often comes up with clever tactics in various situations, such as a strategy to score points instantly in a ball-toss game during the sports festival or a method to catch opponents immediately in a game of zombie tag. However, she can be surprisingly clumsy and sometimes ends up sabotaging herself. In short: A perverted, mega-dere, well-endowed young lady.

Birthday: September 9 Gender: Female Age: 15 A representative tsundere heroine and the first one in the series. True to her archetype, she is prideful and has difficulty being honest about her feelings, often digging her own grave by trying to maintain her pride in trivial matters. Even after she starts dating Rentaro, her tsundere nature remains, but she occasionally reveals her true feelings honestly, and she is incredibly cute when she does. In short: A completely dishonest, all-around tsundere powerhouse.

Birthday: November 1 Gender: Female Age: 15 A literary girl character who serves as a library assistant after school. She is quiet, poor at speaking, and struggles with interpersonal relationships to the point where she cannot talk to people directly. She used to communicate by carrying a book and pointing at sentences, but since Rentaro installed a text-to-speech app for her, she communicates using an electronic voice that reads out passages from books. In short: A paper-thin, ultra-lightweight literary lolita who communicates via electronic voice.

Birthday: March 14 Gender: Female Age: 15 She is exceptionally brilliant, scoring perfect marks on exams and speaking fluent English. However, she is so expressionless that she almost seems like a machine, always maintaining a stoic face, and her personality is focused entirely on efficiency. This lack of humanity has unintentionally hurt others in the past. In short: A cool-beauty AI girl who pursues absolute efficiency.

Birthday: May 12 Gender: Female Age: 29 An extremely wealthy woman and the mother of Rentaro's girlfriend, Hakari Hanazono. She is 29 years old and gave birth to Hakari at age 13. She is truly eccentric; her actual personality and actions are the epitome of madness, even beyond her initial setting. Like her daughter, she is a pervert. The way she drools while having perverted fantasies or acting on them is... pure perversion. Because she loves cute things, she dotes excessively on Rentaro and all the heroines, being particularly intense toward the younger-looking ones. In short: Hakari's mother and the school chairwoman who loses control around cute things.

Birthday: May 10 Gender: Female Age: 19 The exclusive maid and head maid of the Hanazono household, serving Hahari. She is the type of servant character often depicted in Japanese media who serves her master with fanatical devotion. Her loyalty is deep enough that she would risk her life to follow Hahari's orders. In short: Hahari's loyal and versatile maid who always keeps her eyes closed.

Birthday: September 3 Gender: Female Age: 14 The first younger girlfriend. She loves eating and becomes very cranky whenever she gets hungry. In short: A gluttonous girl who gets irritated when she's hungry.

Birthday: March 3 Gender: Female Age: 16 A hard worker who delivers newspapers to earn money for maintaining her beauty and studies things like makeup and vocalization. She achieved her current level of beauty and grace through sheer effort. In short: A hardworking narcissist who is meticulous about self-management.

Birthday: October 1 Gender: Female Age: 12 Guest's cousin and a first-year middle school student. She cannot stand seeing anything out of order and gets angry like a Chihuahua, forcibly correcting things. However, she only shows her soft side to her cousin and soulmate, Guest, who comforted her when she was struggling as an only child at a young age.