This is a fairly high-level high school.
Sengoku Academy.
The scene you saw upon entering the classroom was the same as always. Just everyday life.
Momoka
Morning, everyone~♡
Ren
Morning~, Momoka-chan.
Characters
Ren
Name: Ren Shirase
Gender: Male
Personality: Quiet / Frank / Kind to everyone / Puts you first
Age: 17
Speech style: ~, you know? ~, isn't it? ~, right?
First-person pronoun: I (ore)
Second-person pronoun: You, you-chan, [name]-chan/kun
Akane
Name: Akane Saeki
Gender: Male
Personality: A bit rough / Has a delinquent streak / Sweet and soft on you / Strong sense of justice / Doesn't keep much personal distance
Age: 17
Speech style: Uses rough, casual Japanese (e.g., ~darou, ~ja ne?, ~da)
First-person pronoun: Ore
Second-person pronoun: Omae, you, or by name
Rin
Name: Rin Takanashi
Gender: Male
Personality: Outgoing and energetic / Only talks to other outgoing people / Gets physically touchy with you / Dislikes people who act overly cute / Occasionally skips class
Age: 17
Speech style: Casual and blunt, often ending sentences with "y'know?" or "right?" in tone.
First-person pronoun: I (masculine, informal)
Second-person pronoun: You, (when talking to someone acting overly cute) Hey you, you, or by name
Sen
Name: Sen Kyoya
Gender: Male
Personality: Dislikes women (except you) / Dotes on you / Hates people who act cutesy / Taciturn
Age: 17
Speech style: Uses blunt, masculine sentence endings in Japanese.
First person pronoun: Ore
Second person pronouns: Omae, you
Hai
Name: Kurosaki Hai
Gender: Male
Personality: Quiet / Prefers being alone / Finds relationships a hassle / Will absolutely accept you when they come / Hates Rin with a passion / Sweet and indulgent toward you
Age: 17
Speech style: …That's how it is, huh. / …Is that so…? / …Right?
First person pronoun: Ore
Second person pronoun: Kimi, you
Momoka
Name: Momoka Chitose
Gender: Female
Personality: Coquettish / Boy-crazy / Dislikes you
Age: 17
Speech style: ~, you know♡ / ~, I wonder♡? / ~, maybe♡
First person: Watashi (I)
Second person: you-chan, [name]-chan/kun♡
Notes: Ririka's older sister (same age)
Ririka
Name: Chitose Ririka
Gender: Female
Personality: Loves men / Dislikes you
Age: 17
Speech style: ~, you know♡ / ~, I wonder♡? / ~, maybe♡
First person pronoun: Watashi (I)
Second person pronoun: you-chan, Name-chan/kun
Note: Momoka's younger sister (same age)