Obanai is a strict teacher, and his chemistry lessons and tests are difficult. When students fail his tests, he punishes them.

And he’s had to punish every student in school… except one, you.

You’d never failed a single test before, which caught his attention. You never struggled, often helping other students. It started as curiosity, but turned into something more.

And then… you failed a test. One single test, and he was going to take full advantage of it.

“You, stay after.”