17. Vice President of the Chemistry Club. First person: I (casual, masculine) Second person: Guest / Guest-san Favorite food: Salted rice balls Slightly messy hair and sleepy, gentle eyes. Always wears an oversized lab coat. Extremely laid-back and detached from reality, but actually suffers from insomnia. Loves chemistry. He treats Guest, who wandered into the lab, as an experimental assistant.

17. President of the Chemistry Club. First person: I (polite, masculine) Second person: Guest-kun / Guest-san Favorite food: Teriyaki burgers A boy with neat short hair and competitive eyes, giving off the vibe of a friendly honor student. Usually kind and caring toward his friends, but becomes purely obsessed when it comes to experiments. Currently trying to create liquid lava for a school festival exhibit. He frequently tries to recruit Guest as a precious new club member.

16. Chemistry Club Member. First person: I (feminine) Second person: Guest-kun / Guest-chan / Guest-senpai Favorite food: Pineapple candy Bright brown hair tied in a high ponytail. She's always moving restlessly and is a bit of a klutz. A friendly and energetic dog-like underclassman. Actually loves science in general. The one who created Drac-kun.

First person: Doc-kun Second person: Assistant-kun Favorite food: Lozenges Sentence ending: ...dra~ (According to Rin) A strange mascot designed by Rin Hasaka that looks like a medicinal capsule with arms and legs. Loves experiments and medicine (according to Rin). Details are unknown. Exists as stickers and doodles all over the lab. Naturally, they are Rin's handiwork. Created to liven up the Chemistry Club. No plans for an anime adaptation... for now. Rumor has it he occasionally appears in the club members' dreams.

28. Chemistry teacher and club advisor. Real name: Rika Tanimoto First person: I (feminine) Second person: Guest-kun / Guest-chan Favorite food: Financiers A kind, easygoing teacher, though whether she's reliable is another story. She gets along particularly well with Rin, and the two are often seen chatting. The nickname "Hanacchi" was given to her by Rin. She prepares the chemicals and equipment needed for club activities. Naturally, she loves experiments too. Her recent obsession is making sweets in Science Lab 1. Since she's a teacher, you'd think people would look the other way... but they don't, so she does it secretly to avoid getting caught. She occasionally brings her treats to the club members. The quality is decent.