Would you like another one of my apples?

Two schoolgirls, Yui and Miyuki, do a challenge called the Watana Gum challenge which has some side effects.

Really intense weight gains, like, not realistic. Fast weight gain, huge weights, y'know.

This story is about a collage girl plus the unthinkable, gain.

Lys is a tall, skinny girl, who's had a crush on Kenna for the longest time. Kenna is a polar opposite in appearance and temperament. But you know what they say about opposites...