A teacher at Fujigaya Girls' Academy, her alma mater. Yamashina is the home room teacher of Akira and Ryouko. She is the subject of classroom gossip, as a handful of students claim that she's in a relationship with another woman. Akira overhears them talking about Yamashina-sensei and starts feeling upset when she realises that the other students are not only slandering their teacher but also condemning those in same-sex relationships. Ryouko seems to find the classroom gossip unsavoury and tasteless as well. She knows Oono Haruka personally as she is close to Haruka's older sister Oono Orie. In several flashback segments, it is revealed that Hinako does in fact like women as her students speculate. She had a crush on Orie in high school, and tried on several occasions to give her a love letter (the very same letter that Haruka finds years later while cleaning out her sister's old bedroom). Hinako is also linked to the Sugimoto sisters as she worked alongside Sugimoto Kazusa as teachers in Fujigaya and went to school during the same time as Sugimoto Shinako.
Koichiro's shy stepsister who is also in his class.She has a quiet personality.
Marino is a bad mannered but hard working girl. She is always fighting with Koichiro.
He is a regular customer at Shirokuma Cafe and a friend of Shirokuma. He has a crush on a lady penguin, Penko, who works at a bakery. He is weak to alcoholic beverages.
Akira is optimistic and supportive, always comforting those who need her and searching for ways to solve other people's problems, despite knowing that it would be best not to get involved. She is easily embarrassed but is not shy or reserved, often taking a more aggressive stance against situations. She dislikes seeing people hurt and in her own little ways, tries to avert and avoid potential distress for others. She saves Fumi from a pervert on the train ride to school on their first day of high school. She walks a little way with the tall girl, and finds her to be elegant and gentle and wonders if she will ever see her again. She later expresses shock when it turns out that the girl she saved was none other than her childhood friend. Her mother and Fumi's mother are good friends, and so their relationship is rekindled after Manjoume Yoshie visits Okudaira Shouko, bringing Fumi along with her. Growing up, Akira used to be taller than Fumi thus played the role of her protector and saviour as children (however, as Ah-chan notes, Fumi has got taller but still needs someone to look after her). She is seen neglecting others and herself whenever Fumi needed her. Akira attends Fujigaya Girls' Academy, which is an elite elevator school (meaning that she had taken an entrance exam to be accepted to the high school). She finds herself, despite her upbeat and open personality, a little alienated amongst the long-time students who had also attended the Academy's elementary and middle schools. This feeling soon dissipates when she meets Ikumi Kyouko who becomes her first friend at Fujigaya. Kyouko eventually becomes her closest friend at school. Akira joins the prestigious and renowned Drama Club as a stagehand. In her second year of high school, she lands a role in the school's production of The Deer Cry Pavillion. Despite looking and acting childish, Akira has a deep understanding and acceptance of people. She is very astute to people's feelings, figuring out things about them without being told directly. This is clearly illustrated when she realises that Kyouko may have romantic interests in other girls, and when Fumi comes out of the closet to her. She even goes so far as to reprimand Yasuko for hurting Fumi. She feels completely helpless and depressed when she realises that the bumps in Fumi's love life are the things she can't protect Fumi from. She has an annoying, overprotective brother named Shinobu who tries to insert himself into all aspects of her social life, which includes dropping her to school on mornings and going with her to a mixer to keep boys away. Despite catching the interests of Sawanoi Kou (Kyouko's cousin) and being invited to group dates, Akira says that she is not entirely ready for dating and claims that she does not truly comprehend what romantic love is or what one is supposed to feel or do when it comes to relationships; she wonders if she is immature and needs to grow up, but her own love life seems largely unimportant to her. Most of her concerns seem to be about her friends and helping them when they need her.
She is an elementary school student of Fujigaya Girls' Academy. She plays the title character in the drama festival's adaptation of Antoine de Saint-Exupéry's novel "Le Petit Prince". Akira and Kyouko catch sight of her practising for her performance and are enraptured at the girl's innocent and honest potrayal of her character; the older girls ironically observe that the Prince's dialogue in the play has a deeper meaning to them as teenagers. She presumably gets stage fright on the day of the drama festival, and is found by her lonesome around the grounds of Fujigaya by Sugimoto Yasuko. Yasuko stops the younger girl from crying and comforts her. Le Petit Prince cheers up and listens with great interest as Yasuko tries to explain the character of Heathcliff from Wuthering Heights who she is slated to portray. Given confidence by her senior, she heads off and gives a fine performance.
Shinako is the eldest Sugimoto sister. She is straight-forward and very blunt, though extremely perceptive and easy-going. She seems to dislike conflict finding it dull and unnecessary, and is rarely ever surprised by people's actions. She appears to enjoy being amused at other people's expense. She is an alumna of Fujigaya Girls' Academy, and during her high school years, she was very well known. Through flashbacks from various characters, it is revealed that Shinako's nature had not changed very much from when she was a teenager. She does not care about people's sexual orientation and openly asks Fumi if she's a lesbian or bisexual when she first meets her. She has said herself that she had many "girlfriends" growing up, though this may be only due to her being bored rather than personal attraction to other women. She is an unrelenting flirt though she is also very aloof, a combination which has caused her to seem slightly cruel to those she was ever involved with romantically.