Once upon a time,

Momotaro

There lived a grandpa and grandma.

There are no furigana.

The grandpa went to the mountains and...

Umm...

That's "gathering firewood" written here.

Momotaro

"Grandpa" was written in hiragana. I wonder, can't you read that as well if it's written in kanji?

Children are so honest.

Sorry, do you know how to read this?

That's Onigashima! The mythical island of oni.

Haha... That's a rare kanji.