Aika Kiryuu

Aika has bright orange hair, usually tied into braided pigtails, and wears glasses that give her a classic "bookworm" look.

She looks like a typical literature club girl or a strict class committee member, but she is really just a regular student.

Aika is friendly and talks with everyone, even with people other girls don't like, like Issei and his friends.

She isn't afraid to tease people and says what’s on her mind.

Her sharp jokes and witty comments often make people laugh or feel embarrassed.

Even after learning about the supernatural secrets of the Occult Research Club members, she treats them the same as before.

Aika is a second-year student at Kuoh Academy, the same as Issei Hyoudou.

She quickly became close friends with Asia Argento, who transferred into their class.

Because of Asia, Aika also became friends with Issei, Matsuda, and Motohama, the so-called "pervert trio."

Unlike other girls who avoid them, she stays neutral and is even Issei’s biggest supporter.

At first, she is just a normal human and an everyday student.

Aika’s special ability is using her glasses to see and measure things related to "male pride," basically being able to give number scores to a boy's manliness.

Because of this skill, people often call her "The Expert."

She often teases Asia or Xenovia by sharing her “funny observations” with them.

• Issei Hyoudou: Classmate and fully supports him, not scared of his wild reputation.
• Asia Argento: Best friend, always by her side, gives her advice on romance and confidence.
• Matsuda and Motohama: Treats them as friends and jokes with them, but never lets their pervy behavior get to her.
• Xenovia Quarta: Sometimes teases her, especially about matters of love.
• Lavinia: Later becomes Lavinia’s apprentice, showing her growing interest in magic.

“Aisa, your boyfriend is calling you.”

“Hmmm, is that so? But you two act like a couple who combine every night! You’re always together and so close, right? Living together with parents’ approval, and you’re young... What do you even do at night under the same roof? Hehe. By the way, I’m the one who taught you about ‘bathing together’! Well? Did you enjoy it?”

“Sorry, I’m coming too.”

“What is that, Matsuda? Don’t put me in the same group as that pervert with glasses. My reputation will be stained.”

“...Do you really think that ability only belongs to Motohama?”

“Hehe, with my glasses, I can measure any boy’s size and width, from tiny to extra thick.”

“Don’t worry. You’re above average. Too big is tough for girls, but small is no good, either. Both Rias Gremory and Asia should be happy.”

“Good for you, Asia!”

“What, is Hyoudou going to do something wild again?”

“But, is it okay if you cuddle Xenovia? Won’t Asia be...”

“Asia, didn’t I tell you? You need to make your move, or Hyoudou will get snapped up. He is surrounded by strong girls. If you don’t act, some other girl may claim him first. You wouldn’t want him smelling like another woman, would you?”

“I’m worried. It’s good for you to have a friend like me, right? Looking innocent is great, but when it’s time to act, act! You are ready, Asia!”

“Well done, Asia! Enjoy yourself!”

“...Pretty short nails, huh?”

“I heard guys with short nails are players. You know, having long nails makes it hard to... well, explore a woman’s body.”

“Scary! You’re like a beast. At least be careful so you don’t give Asia any bugs. Keep her pure.”

“You smell like a virgin!”

“I bet you wasted your summer, didn’t you?”

“If your kids look like their dad, that’s kind of tragic, isn’t it?”

Kuoh Academy Student Life

Aika is one of the second-year girls at Kuoh Academy.

She looks like a classic committee member, but she is a totally normal student.

When Asia Argento transfers into Issei’s class, Aika quickly befriends her and also becomes friends with Issei and his friends.

Unlike girls like Murayama or Katase, who dislike Issei’s group, Aika stays neutral and even supports Issei.

Discovering the Club's Secrets

Aika doesn’t know about the Occult Research Club’s real activities at first.

But later, it’s revealed she was working with Xenovia as a special contact.

Her sharp mind lets her figure out things others miss.

She’s often seen teasing Issei in front of Matsuda and Motohama, making them look even more ridiculous.

Joining the Magician Organization

In the final chapters, Aika decides it's best to help Asia and the others.

She joins the "Gray Magicians" and starts learning magic under Lavinia.

She focuses on fortune-telling and magic for profit, showing a practical approach and a new side of herself.

• Aika often uses her skill to tease her friends by sharing funny or embarrassing “scores.”
• She often brings up silly or mature topics in a joking way, but she is always caring at heart.
• Even though she has no powers at first, she doesn’t hesitate to step into the world of magic for her friends.