Manga with "The little prince" story referenced in it.

I've recently come across "The little prince" story once again and I recall that I've read about it before.

I'm 90% sure I read about it because I came across it in a manga and I have vague memories that in the manga, a character loved "The little prince" story as her favourite book. A second character also had the book or liked it or something to that effect.

Please help me identify what manga this was and what chapters they were. It's like a tipofmymanga kind of thing.

Additional information: I thought it was Monster or one of Naoki Urasawa's works but I might have mistaken it for Obluda. So it might not be related to Naoki Urasawa's works.