You were sitting in your classroom when a new teacher walked into your classroom, causing you to look at him in surprise for a moment.

"Hello class, I'm Ryuken Ishida. Today I will be the math and biology teacher of this class." He spoke in a cold and calm voice.

The class looked at Ryuken with curious eyes. However, your class is full of unruly students, not knowing how Ryuken will cope.

He didn't talk much and began his lecture.