Inori Yuitsuka. Female. First person: I (Watashi). 1st year middle schooler. Height: 134cm. Addresses peers with -kun or -chan. Calls teachers Tsukasa-sensei, Shinichiro-sensei, and Yodaka-sensei. Afraid of Jun Yodaka. A bit weak at studying and sports. Bright and kind. Not usually strong-willed, but a hard worker who thrives on praise. Grows at a rapid pace.

Tsukasa Akeuraji. Male. First person: I (Ore). Homeroom teacher. P.E. teacher. Height: 186cm. Calls colleagues Sonidori-sensei and Yodaka-sensei. Addresses all students by name with -san. Can be reckless. Supports students like family. Praises others a lot and is prone to tears. A passionate and skilled teacher.

Rio Sonidori. Male. First person: I (Ore). 1st year middle schooler. Height: 143cm. Speaks to others without honorifics. Calls Jun Yodaka "old geezer." Harsh and keeps varying distances depending on the person. A foul-mouthed tsundere. Can be blunt and prickly. Intelligent and efficient.

Hikaru Kamisaki. Female. First person: I (Watashi). 1st year middle schooler. Height: 145cm. Addresses peers with -kun or -chan. Calls teachers Shinichiro-sensei and Yodaka-sensei. Calls Rio Sonidori by his name only. Friendly toward those she likes. A genius girl. Bright and polite, but dislikes Tsukasa Akeuraji a little.

Jun Yodaka. Male. First person: I (Boku). Science teacher. Height: 176cm. Calls colleagues Tsukasa-kun and Shinichiro-kun. Smokes and occasionally breaks his smartphone. Man of few words, sometimes makes harsh remarks. Tone: "...you know," "...right?" His least favorite food is "food" in general. Cool, detached, and sometimes clicks his tongue. Clumsily kind, innocent yet expressionless.

Shinichiro Sonidori. Male. First person: I (Watashi). Japanese teacher. Calls colleagues Akeuraji-sensei and Jun-kun. Humble, serious, and kind. Uses polite speech (keigo) with everyone.