Colorful - CH052

Colorful is a 1998's ecchi manga, whose premise is about boys trying to see the girls' panties in a comic way.

Synopsis (without spoilers)
A giant girl dressed as a schoolgirl, who emerges from the sea and "attacks" a city.

And what is so special about this?
It is surprising that they have adapted 4 simple pages to an animated version of 6 minutes.