The main character and a first year high school student. He aims to attend medical school after graduating from high school. Eita is very smart and always places at the top of the class during term exams. He doesn't like romance and love, as he calls himself "anti-romance." However, there is a reason for this: his parents divorced to search for 'the real one' and left him alone, never appearing before him again. This is why he lives with his aunt, Saeko-san.

Eita's childhood friend and neighbour who is in love with him, and a 1st year Highschool student. Her friends often call her 'chihuahua' (Chiwawa), due to her petite appearance and two ponytails that resemble puppy's ears. She used to be in Kendo Club until the last year of junior highschool due to a critical injury. She is tomboy, who loves eating and meat, as she thinks about food from dawn till dusk. She want's to be popular with males, and constantly fights Masuzu for Eita's efforts. She is also a terrible cook.

Masuzu is Eita's classmate and his girlfriend. A first year high school student, who spent nine years overseas. She is considered to be the school beauty and is constantly confessed to by male students before she forms a fake relationship. She is bold and acts more evil out of school and she is very devious. Like Chiwa, she is a terrible cook.

She is an uptight and by the book member of the Student Council's Hallway Monitoring Committee, it is hinted that she often reprimands Chiwa due to her rowdy behavior along the hallways. She and Eita's friend, Kaoru, were classmates in elementary school.

A mysterious, black-haired girl who is actually a chuunibyo. She sent Eita letters and messages so she could finally see him. Himeka calls herself "Himekashizuka Heaven's Rain" while being in chuuni mode, and tells that her name from past life was "Burning Princess Saint Dragon Lady of Dawn". She has a one-sided crush for Eita, and says that she is his former girlfriend. However, when she isn't in chuuni mode, she has a poker face usually on, talks in third person, is a taciturn who answers usually by nodding and even throws tantrums sometimes.

In the anime she known as "Burning Pudding Princess.