Ninako Kinoshita

I wonder what you should do to fall in love~

The main protagonist. Often naive or clueless, but only truly understands things if she tries it herself. Falls in love with Ren.

• Boy Meets Girl: Boy Meets Girl On Train (for Ninako/Ren). Boy Meets Girl But Girl Was Expecting Other Boy (for Ninako/Andou).
• The Chick
• Curtains Match the Window
• Love Hurts
• Naïve Everygirl
• Single Girl Seeks Most Popular Guy

Ren Ichinose

The most popular guy in school. Seemingly cold, but is actually a nice guy.

• Always Save the Girl
• Big Man on Campus
• Boy Meets Girl: Boy Meets Girl On Train (for Ninako/Ren).
• Brown Eyes
• Curtains Match the Window
• Defrosting Ice King
• Friendless Background: In middle school, Ren didn't have any friends and was ostracized by the boys for being popular with the girls... and his only best friend lost trust in him after an incident that wasn't even his fault.
• Green-Eyed Monster: He briefly gets jealous of Toda when he notices that they get along with each other really well.
• Love Hurts
• Nice Guy: Even though he looks intimidating, he's really a nice person, and it's because of this Ninako befriends and falls in love with him.
• School Idol
• Second Love: Ninako.
• Tall, Dark and Handsome
• The Rival: Andou.
• Unwanted Harem: Ren doesn't really understand why he's popular, but he still keeps their love letters anyway.

Takumi Andou

Ren's middle school friend. Andou develops unrequited feelings for Ninako.

• Boy Meets Girl: Boy Meets Girl But Girl Was Expecting Other Boy (for Ninako/Andou).
• Brutal Honesty
• The Casanova
• Curtains Match the Window: Golden hair + Gold eyes.
• Dogged Nice Guy
• Green-Eyed Monster: Andou is jealous of Ren, who was kissed by his first love during middle school and is now the object of his second love Ninako's affections.
• Handsome Lech
• Hopeless Suitor
• Jerk with a Heart of Gold
• I Want My Beloved to Be Happy
• Ladykiller In Love: Andou stops his Handsome Lech tendencies when he decides to pursue Ninako, but falls short into this after he gets beat up minutes before Ren's Love Confession to Ninako.
• Love Hurts
• Second Love: Ninako.
• The Rival: Ren.
• Troubled, but Cute

Daiki Korenaga

Ninako's childhood friend. Daiki has feelings for her.

• Anguished Declaration of Love
• Clingy Jealous Boy: A mild degree when Daiki realizes Ninako feels "something" towards Ren and sees Ren as his love rival for Ninako's affections.
• Curtains Match the Window
• Demoted to Extra: Once Daiki gets over Ninako, he only appears sporadically for the rest of the manga.
• Dogged Nice Guy
• Hopeless Suitor: Towards Ninako.
• Large Ham: Has some moments of being this, but Sayuri likes it.
• Love Hurts
• Pair the Spares: Ends up dating Sayuri, Ninako's friend.
• The Rival: Ren, at first.
• Second Love: Sayuri.
• Unlucky Childhood Friend

Sayuri Uehara

• Ascended Extra: Sayuri gains more plot significance once the manga begins to deal with her relationship with Daiki. Also, out of Ninako's friends, she is the only one featured on the cover of one of the manga volumes.
• Second Love: For Daiki, she is his second love. In regards to herself, Yuutarou may have been her second love, but it's unclear to how many boys she dated before him.

Tsukasa, Tamaki, and Noriko

• The Ditz: Tsukasa, who tends to be a blabbermouth.
• Genki Girl: Tsukasa.
• Only Known by Their Nickname: Noriko is always called "Non-chan."
• Shipper on Deck: All of them, including Sayuri, try to get Ninako and Ren together (though they'd do it anyway as long as they're aware of a potential romantic attraction, as they all shipped Ninako with Daiki in the beginning).

Manabu Miyoshi

• Ascended Extra: He was originally part of Those Two Guys with Yuu, but gets a larger role after volume 3.
• Keet
• Only Known by Their Nickname: He's known as "Gacchan" to the girls.
• Shipper on Deck: Manabu ships Ren and Ninako and has on more than one occasion tried to get them together. It gets to the point where Yuutarou has to call him out and tell him to mind his own business.
• Stepford Smiler: Manabu shows a minor case of type A at the end of his side story after Ritsuko, his First Love, goes to study abroad.

Yuutarou Terada

• Ascended Extra: He was originally part of Those Two Guys with Manabu, but gets a larger role after volume 3.
• Big Brother Mentor: He assumes this role when he sees Ren fumble over his newfound feelings for Ninako.
• Characterization Marches On: Before becoming an Ascended Extra and receiving Character Development, Yuu seemed more excitable and carefree.
• I Want My Beloved to Be Happy: He dated Sayuri when they were in middle school. When Sayuri starts believing Daiki could be cheating on her, rather than taking advantage of the rift between their relationship, he encourages her to make up with him.
• Only Known by Their Nickname: Everyone either shortens his name to "Yuu" or Tera."
• Wise Beyond Their Years

Mayuka Korenaga

Mayuka is a famous model, Daiki's older sister, and Ren's girlfriend.

• Cool Big Sis
• I Want My Beloved to Be Happy: She breaks up with Ren because she knows she is holding him back from accepting his feelings for Ninako.
• Love Hurts
• Romantic False Lead: She's a more likable and sympathetic kind of False Lead than usual.
• Sibling Yin-Yang: Mayuka's the Foolish Sibling to Daiki's Responsible Sibling. She's peppy and cheerful in comparison to Daiki's more cynical behavior (when he's not being a Large Ham, of course) and has more of a harder time accepting her parents' divorce while Daiki has pretty much come to terms with it.

Mao Sugimoto

Mao is Andou's First Love and ex-girlfriend who cheated on him with Ren, permanently damaging their friendship.

• The Atoner
• Becoming the Mask: Mao originally dated Andou just to get over Ren, and ended up falling in love with him for real.
• Bitch in Sheep's Clothing: Mao acts as a Manipulative Bitch to separate Ninako from Ren, but turns out to be a Red Herring because she is doing it to get Andou and Ninako together.
• I Want My Beloved to Be Happy: Mao interferes with Ninako and Ren's relationship only because she knows Andou likes Ninako.
• Must Make Amends

Toda

Toda is an upperclassmen who becomes the leader of cheer squad for Ninako's team for the sports festival.

• Large Ham
• No Indoor Voice: Subverted. In chapter 29, he speaks to her softly and Ninako even Lampshades it in her thoughts.