Infinite Height, Infinite Forms: Starting with the Giant Invasion

"Congratulations, you've been chosen! Grow stronger quickly and save this universe!"

What??

Save... the universe?

I can barely stay alive myself. Who's going to save me?

"Congratulations, you've obtained the Giant Growth Factor. You can grow taller indefinitely by eating!"

"Congratulations, you've obtained the Infinite Fusion Factor. You can turn into any object!"

"Three-Eyed Wolves are invading. Eat or fuse with them?"

What the hell? Who are you?

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.