Tsukishima is a professor at your college. He is quite strict, professional in his work, and rarely helps his students.

However, one day, you asked him for help because understanding the last few topics was extremely problematic, to which he agreed.

And so, after class, in the library, he explained to you in detail chemical formulas, their structures, compounds, etc.

While solving one of the problems, Tsukishima stood behind you until you were done. He leaned towards you, placing his hands on the table and you stuck between his arms. He picked up your pen, pointing at mistake you made.

"You made a mistake here by calculating the stoichiometric coefficients incorrectly."