Rio Futaba is a high school girl who was born on October 23 and is 155 cm tall. She is a second-year student at Minegahara High School and the only member of the science club. She has long, slightly wavy hair and usually wears glasses, though she switches to contact lenses after entering college. Rio is calm and logical, often helping her friends with problems, and keeps her true feelings hidden. She is good at housework since she lives alone and loves studying physics. Rio continues her friendship with Sakuta Azusagawa and Yūma Kunimi even after they graduate.
Appearance
Rio Futaba has long hair that is a bit wavy.
She usually lets it hang down naturally, but sometimes ties it in a ponytail.
At school, she wears glasses, but in college she often uses contact lenses.
She is 155 cm tall.
She wears a white lab coat at school to hide her big chest because she feels nervous about boys looking at her.
Personality
Rio is calm and does not show her feelings very much.
She looks at things like a third-person and always tries to understand situations logically.
She makes sharp, sometimes mean comments to Sakuta Azusagawa, calling him "Rascal."
But deep down, she really cares about her friends.
She does not like to be the center of attention and sometimes says bad things about her own looks.
Background
Rio Futaba is a second-year student at Minegahara High School.
Her birthday is October 23.
She is the only member of the science club and continues club activities on her own.
Her parents are very busy, so she has lived alone for about six months.
This made her good at cooking, cleaning, and other house chores.
Her nearest train station is Hon-Kugenuma Station.
After finishing high school, she entered a science course at a national university.
She joined a different department than Sakuta Azusagawa, but they both work as teachers at the same cram school.
Abilities
Rio is very good at physics.
She likes to use quantum theory and relativity when talking about strange problems, like the Adolescence Syndrome.
She can explain difficult science topics in a way her friends can understand.
Relationships
Rio became friends with Sakuta Azusagawa when he was lonely in his first year of high school.
They are close and she always listens to his worries.
She also knows about things that happened before Sakuta started dating Mai Sakurajima, like the problems with Kaede Azusagawa and Shoko Makinohara.
Rio has a secret crush on Yūma Kunimi.
She talks to him as a friend and keeps her feelings hidden.
Even after graduation, she keeps in touch with Sakuta and Yūma.
Plot
Becoming Friends with Sakuta
Rio noticed that Sakuta was alone and unhappy during their first year of high school.
She reached out to him, and they became friends.
Ever since, she has supported him, especially when he faces weird or confusing things related to Adolescence Syndrome.
Helping with Adolescence Syndrome
Rio is often the person Sakuta and his friends go to for help when strange things start happening.
She uses her science knowledge to explain these events and looks for solutions.
College Life and Part-Time Job
After finishing high school, Rio moved on to a science program at a national university.
She continues her friendship with Sakuta, even though they are in different departments.
They both work at the same cram school as part-time teachers.
Rio stays in contact with Yūma and meets up with him and Sakuta after Yūma finishes his firefighter training.
Trivia
Rio uses contact lenses more often as a college student.
She dislikes attention from boys, so she wears a lab coat at school.
She sometimes feels uncomfortable about her appearance.
She runs the science club alone at Minegahara High School.
Quotes
"I just tell you the facts, Rascal."
"Try to use logic, not just feelings."
"You really don't see things the way other people do, Sakuta."
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