Allen, a programmer, transmigrates to the Harry Potter world and gains the unique talent of random partial transfiguration each day.

In Flying Class, he sprouts wings.

Exploring the Forbidden Forest, he grows a turtle shell.

To heal himself, he transforms a unicorn's hoof.

And because of a transformed tongue, he develops a deep, bitter feud with Voldemort.

Elephant ears, a snake's nose, a phoenix's eyes, an octopus's tentacles, a giraffe's neck, penguin legs, a peacock's tail, dragon scales...

These transformations bring him all sorts of advantages and troubles...

They also lead him, step by step, to understand the magical essence of this world, pushing Transfiguration to new heights.

He initially just wanted to protect himself and stay far away from trouble, but to his surprise, trouble kept finding him.

Even more unexpectedly, in this magical world, he even started using programming concepts to DIY all sorts of transformed beasts...