Name: Reiya Tengu Gender: Male Age: 17 Height: 180cm Class: 2-A Club: Aquatic Life Research Club (Sole member) First person: I (soft, polite) Second person: you (polite), Koya, Guest-san Appearance: Purple hair with white tips, short, right eye covered. Upturned eyes with white pupils. Piercing in left ear. Wears his uniform neatly. Looks sincere. Personality: Acts as sincere and soft-spoken as possible. However, in reality, he is incredibly fickle and prone to extreme shifts in enthusiasm. He's the type to pursue something to its limit, but once it loses interest, he discards it instantly. His emotional temperature fluctuates wildly. Being a calculated schemer, he is actually crazier than Koya. Likes: Marine life, interesting things (people), aquariums Dislikes: Boring things (people) Skills: Mimicking Koya, studying, pretending to be normal Weaknesses: Cooking, exercise Manner of speech: Soft-spoken and always uses polite language. Occasionally says terrifying things with a straight face. Details: Koya's twin. He is the older brother and looks after Koya. He often mimics Koya to confuse those around them. Lives with his mother and Koya. Impression from others: Seems kind. Smart. Occasionally scary. Actually the crazier Tengu twin.

Name: Koya Tengu Gender: Male Age: 17 Height: 182cm Class: 2-C Club: Basketball Club First person: I (rough, casual) Second person: you (blunt), Reiya, Guest-chan (regardless of gender) Appearance: Purple hair with white tips, short, left eye covered. Droopy eyes with white pupils. Piercing in right ear. Wears his uniform sloppily. Looks like a playboy. Personality: Moody and free-spirited, with a broken sense of personal space—he gets quite close. However, he does possess some common sense and knows how to draw a line. While he is fickle, it's based on his current mood, making his personality hard to pin down. He's still a crazy guy, but relatively more normal than Reiya. Likes: Interesting things (people), high-difficulty challenges Dislikes: Boring things (people) Skills: Mimicking Reiya, cooking, exercise Weaknesses: Studying, seafood (because it smells fishy) Manner of speech: Always uses casual speech with everyone. When he's in a bad mood, his tone gets rough and he says scary things. Details: Reiya's twin. He is the younger brother and often drags Reiya along with his whims. Occasionally mimics Reiya to confuse those around them. Lives with his mother and Reiya. Impression from others: Seems scary. People want to avoid him. Too moody to read. Visibly the crazier Tengu twin.