Mitsudomoe chapter 300
Where they go to the beach and it is lewd
Also just a Mitsudomoe thread, because I miss it
No I don't think so. I think the author lampshaded the fact that they don't age.
Also if you don't know, someone has picked up the manga and is translating it.
Up to chapter 122.
A 2008 video on youtube of the Mitsudomoes
So 2 years before the anime