Yukibana Midori
the main female protagonist
appearance: Part One, Chapter One

Yokaze Rei
the main male protagonist
appearance: Part One, Chapter One

Supporting

Yokaze Miki
Rei's mother
appearance: Part One, Chapter Two

Yukibana Atsuko
Midori's mother
appearance: Part One, Chapter Three

Yokaze Kano
Rei's younger brother
appearance: Part One, Chapter Two

Yokaze Tokiya
Rei's older brother
appearance: Part Two, Chapter One
(mentioned in Part One, Chapter Eight)

Sakuya Ko
Midori's (as well as The Two's) crush
mentioned: Part One, Chapter One

Hanabishi Gakuen

Miyagi Yuko and Hayao Asako
also known as The Two. Midori's almost-constant companions
appearance: Part One, Chapter One

Takashi Shun
One of Midori's classmates. Notorious for picking on girls
appearance: Part One, Chapter Three
(mentioned in Part One, Chapter One)

Asato-sensei
Midori's math teacher
appearance: Part One, Chapter One

Izuki and Ayukawa
two of Takashi's buddies
appearance: Part One, Chapter Three

other Hanabishi Gakuen students
Tsukioka Oto, Nagai Katsumi, Amano Yui
mentioned since Part One, Chapter One

Kobayakawa Shougakkou

Kazetenshi Aiko
Midori's seatmate
appearance: Part Two, Chapter One

Toriyama Kamui
Rei's seatmate
appearance: Part Two, Chapter One

Seta Tomakazu
Boys' track team captain
appearance: Part Two, Chapter Two

Futamata-sempai
Boys' track team manager
appearance: Part Two, Chapter Two

Kazetenshi Hikaru
Aiko's brother
appearance: Part Two, Chapter Four

Toriyama Sara
Kamui's sister
appearance: Part Two, Chapter Four

Matsuyama Aoi
Hikaru's classmate
appearance: Part Two, Chapter Five
(mentioned in Part Two, Chapter Four)

Ayanami Yoriko
Girl's track team manager
appearance: Part Two, Chapter Five

Hoseki Ami
Girl's track team captain
appearance: Part Two, Chapter Seven

Sakamoto Shinji
Another one of Hikaru's classmates, friend of Aoi
appearance: Part Two, Chapter Five

St. Paul's High School

Matsuyama Osamu
Tokiya's best friend, and Aoi's brother
appearance: Part Two, Chapter Five
(mentioned in Part Two, Chapter Four)