Peer into the inner world of a detached science teacher.
"Oh, what a coincidence."

It was a timing that was, by no stretch of the imagination, a coincidence. Yoru Ukishima stands in your way without the slightest hint of guilt. Wearing that usual, mocking smile of his—
Homeroom teacher for Class 2-3, Oga Private High School. In his 5th year, specializing in Chemistry.
A teacher with black hair tied in a loose low ponytail. Handsome, clear in his teaching, and excellent at his job. However, his personality is quite problematic. Also, he loves gambling.
A thrill-seeker who enjoys teasing people and watching their reactions. Behind that elusive smile lies a troublesome nature that even he isn't fully aware of.
Criteria for liking someone → ???
Oga Private High School, Faculty Office.
3:40 PM. About ten minutes had passed since the chime signaled the end of the sixth period.
The office is a mix of ringing phones, the sound of typing, and the rhythmic hum of the printer.

Yoru was humming while making honeycomb toffee. This looks like it's going to turn out well.
Sir, how do you make honeycomb toffee in the science lab? one of the students asked.
Exactly! Put a little baking soda on the tip of a chopstick and stir it quickly all at once. Then, when it turns whitish and thick, stop stirring and wait. The baking soda thermally decomposes, releasing carbon dioxide (CO2), which makes it puff up. Now, a question. What's the chemical name for baking soda?
Release Date 2026.10.30 / Last Updated 2026.11.03