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troperville

The Protagonist. Antisocial and introverted, first year high school student Kaoru has been constantly moving from town to town and transferring schools due to his father's naval job, his latest move bringing him to Kyushu. He is a classical pianist, but after befriending Sentarou and Ritsuko, he develops an interest in jazz. He has feelings for Ritsuko.

All Love Is Unrequited: Subverted. He has unrequited feelings for Ritsuko (who initially has feelings for Sentarou instead), but she eventually reciprocates his feelings.
Brains and Brawn: The Brains to Sentarou's Brawn.
Chick Magnet: After the cultural festival, much to his bewilderment.
Brown Eyes
Dogged Nice Guy: To Ritsuko.
The Glasses Gotta Go: A male example. He sometimes deliberately takes off his glasses around Ritsuko because she complimented his face.
Heterosexual Life Partners: With Sentarou.
I Want My Beloved to Be Happy: He genuinely wants to support Ritsuko, in spite of his own feelings.
In-Series Nickname: Sentarou refers to him as "Bon," which is short for "Bonbon-dono"—the Kansai dialect for a green or naive man from a well-to-do family. The Crunchyroll subs adapt it as "Richie."
Intelligence Equals Isolation
Megane
New Transfer Student
No Celebrities Were Harmed: most likely inspired by Bill Evans, he's even compared to him multiple times in the series!
Parental Abandonment
Red Oni, Blue Oni: The Blue Oni to Sentarou's Red Oni.
Shipper on Deck: For Sentarou/Yurika, partly because he knows Sentarou is in love with Yurika and just wanted him to realize it and partly so Sentarou doesn't get in the way of his chances with Ritsuko. However, he is immediately guilt-ridden about his latter underhanded intentions when Sentarou appreciates how understanding he is (and when he realizes that since Ritsuko is in love with Sentarou, it hurts her to see him so obviously taken with Yurika).
Three Amigos: With Sentarou and Ritsuko.

Sentarou Kawabuki

Voiced by: Yoshimasa Hoyosa (Japanese), Andrew Love (English)

Kaoru's classmate and Ritsuko's childhood friend, Sentarou often gets into fights with other students and is labeled a delinquent. He befriends Kaoru, and despite their differences, they both have a mutual passion for jazz. His preferred instrument is the drums. He has feelings for Yurika.

Adorkable: Especially in regards to his crush on Yurika.
All Love Is Unrequited
Almost Kiss: With Yurika. It gets interrupted by Junichi.
Brains and Brawn: The Brawn to Kaoru's Brains.
Childhood Friends: With Ritsuko.
Creepy Cool Crosses: Wears a rosary around his neck. When asked about it, he quickly rebuffs the subject.
Curtains Match the Window
Dark and Troubled Past
Delinquent
Dogged Nice Guy: To Yurika.
Doorstop Baby
Gentle Giant: In spite of his label as a delinquent and his tendency to get into fights, he is particularly upbeat with Kaoru and Ritsuko, as well as a friendly and lighthearted older brother to his younger siblings.
Heterosexual Life Partners: With Kaoru.
Hidden Depths
In-Series Nickname: "Sen-bou."
It's All My Fault
Japanese Christian
Love Makes You Dumb
Mixed Ancestry
Nice Hat
Oblivious to Love: Towards Ritsuko. He finally realizes it later on in the show but by that point she had fallen in love with Kaoru.
Red Oni, Blue Oni: The Red Oni to Kaoru's Blue Oni.
Rescue Romance: He falls for Yurika immediately after rescuing her from harassers.
Scars Are Forever: Has a X-shaped scar by his left eye.
Three Amigos: With Kaoru and Ritsuko.
Wrong Guy First: Ritsuko initially has feelings for him, but she eventually falls in love with Kaoru, who has always been by her side and had been supportive of her.
X Marks The Hero: see Scars Are Forever.
Younger Than He Looks: At the start of the series, he is fifteen-years-old, a year younger than Kaoru.

Ritsuko Mukae

Voiced by: Yuuka Nanri (Japanese), Rebekah Stevens (English)

The class representative in Kaoru's class. Ritsuko is a kindhearted and caring girl, as well as Sentarou's childhood friend. She is the poster girl of her father's record store, Welcome Records, which doubles as a hangout for Kaoru, Sentarou, and other jazz lovers. Kaoru has a crush on her, but she has feelings for Sentarou instead.

All Love Is Unrequited: Subverted. She has unrequited feelings for Sentarou (and is the object of Kaoru's unrequited affections), but overtime, she eventually reciprocates Kaoru's feelings.
Brown Eyes
Childhood Friends: With Sentarou.
- Childhood Friend Romance: Has unrequited feelings for Sentarou.
Class Representative: A particularly nice one.
The Cutie
Genki Girl
Girl Next Door
Girlish Pigtails
Green-Eyed Monster: Her depression and jealousy towards Sentarou's closeness to Yurika during their group date to the Rendezvous Crag culminates in her having small outburst when Yurika suggests going to the top of the crag with one of the boys (where it is said a couple who does that will stay together forever) and later crying in the woods.
Hair Decorations
In-Series Nickname: "Ricchan" and "Rikko."
Japanese Christian
Meet Cute
Nice Girl
Oblivious to Love: Towards Kaoru until he confesses to her.
Second Love: She later falls in love with Kaoru.
Three Amigos: With Kaoru and Sentarou.
Youthful Freckles

Yurika Fukahori

Voiced by: Aya Endo (Japanese), Maggie Flecknoe (English)

A beautiful second year high school student who Sentarou rescues from harassers at the beach. She has a spunky and curious personality. Sentarou has a crush on her, but she develops feelings for Junichi.

Almost Kiss: With Sentarou. It gets interrupted by Junichi.
Curtains Match the Window
Elopement: Elopes with Junichi to Tokyo.
In-Series Nickname: She is briefly called "Ojou-sama" by Junichi until he learns her name. She feels insulted by the nickname because it makes her feel like she is being mocked. However, following the Christmas party and after getting charmed by Junichi's performance on-stage, she develops a better opinion of him—as well as a crush on him.
Important Haircut
Long Hair Is Feminine
Love at First Note: She falls for Junichi the moment he starts singing on-stage during the Christmas party.
Meet Cute
Oblivious to Love: Towards Sentarou. She eventually realizes it and has some regret about hurting his feelings.
Official Couple: With Junichi.
The Ojou
Spoiled Sweet
Yamato Nadeshiko: A well-spoken lady... she's even a naginata fencer.

Junichi Katsuragi

Voiced by: Junichi Suwabe/Masayoshi Furukawa (Japanese), David Matranga (English)

Ritsuko's neighbor and a big brother figure to Sentarou. Junichi attends a university in Tokyo, but he visits Welcome Records whenever he's in town. He plays the trumpet. Yurika develops a crush on him.

Big Brother Mentor
Broken Pedestal: For Sentarou in when the latter finds he is involved with Yurika.
Curtains Match the Window
Elopement: Elopes with Yurika to Tokyo. He originally didn't want her to because his professional future there is unsure, but pulled her into the train with him at the last minute when he realized her parents would make her marry someone she didn't want to otherwise.
The Danza
In-Series Nickname: "Jun-nii"/"Brother Jun."
Official Couple: With Yurika.
No Celebrities Were Harmed: Very likely inspired by Chet Baker's real life, in more than one way.
Recurring Character
Smoking Is Cool