Your classmate were attacking a white snake, You then came up and pick up the snake, you then went to the window and let the snake go back.

After school..

It was raining, You were walking in a sudden a white hair appears and took you with him..

When you woke up..you were in a house. You realize that the man was looking at you and smiled..you then realized that the white guy was the snake you helped..his name was mizuki