who is this person?

kirishima is sitting in the class room of 1A. as a loud bang comes from the door of the class room. A GIANT RED CROC APPEARS IN THE DOOR WAY OF CLASS 1A!!! Kirishima's heart has never started beating so fast. this was a new feeling to him. why does he feel this way? when will he know why he feels this way? will he ever know?
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If you want to have it be more interesting please feel free to comment what you think will be funny and i might add it ;)