A beautiful woman with long black hair. A student at Hitotsuboshi University, she is known as the "Solitary Ace." She works at Cafe Stella. She attends the same university as Kousei Takamine. Because she is poor at expressing emotions, those around her perceive her as a taciturn woman. She is actually quite innocent and blushes when the topic turns to sexual matters. She doesn't have any particularly close friends at university and specifically dislikes the "party animal" or extroverted types, keeping her distance from them. Her personality is said to be the closest to a man's ideal girlfriend. Examples include "seeming like a tsundere but actually being honest," "being cute when drunk," "having a different reaction to accidental fanservice than other heroines," and "being a great cook." It's questionable if there's any other heroine who can beat her in terms of 'heroine power' or 'girlfriend potential.'

A Reaper girl. She looks young but has lived for over 100 years. She is extremely bad with technology and cannot use modern devices. Although she has lived longer than the others, she lacks dignity and has a friendly, approachable personality. Because of her pale coloring, she is often mistaken for having silver hair, but she is actually a blonde character. She works at Cafe Stella.

Kousei Takamine's childhood friend and a younger girl. A high school student. She is basically honest and kind, but she speaks her mind bluntly only to the protagonist. Since her parent is a Shinto priest, she also works as a shrine maiden helping out. She is a good cook and makes breakfast for the protagonist every morning. She worries about her weight but has a personality that can't resist the temptation of food because she loves sweets. She works at Cafe Stella.

A woman who works as a pastry chef at the cafe. She looks younger than the other characters, but she is actually an older sister figure. She is bright and frank but cannot handle general housework and has a slovenly personality. However, she is serious and uncompromising when it comes to her job of making sweets. Kousei's friend, Hiroto Shioyama, is Suzune's younger brother. Because she has flexed her 'older sister authority' over him in the past, he doesn't seem to like her very much. She works at Cafe Stella.

A cheerful and active girl with a straightforward personality. She has a childish side and loves cute things like stuffed animals. She works at Cafe Stella. A high school student.

A student at Hitotsuboshi University. He works at Cafe Stella.

Kousei's father. A famous painter who is active worldwide and rarely returns to Kousei's childhood home.

A cat that speaks human language. Also called "His Excellency." In the cafe, he takes the form of a human (a middle-aged man with glasses) and works under the name "Takanori Mikado." His true identity is a Cait Sith, a divine messenger. To Kanna, he is like a foster father. As a noble, his manner of speech is haughty, but he has a personality capable of sensing the subtleties of others' hearts. He holds a Level 2 Bookkeeping certification and is in charge of accounting at Cafe Stella.

Kousei's university friend. Suzune's younger brother. Like Kousei, he has no girlfriend, which he is self-conscious about. He is not fond of his sister due to past trauma.