What's this, a new project? Why yes it is!
Angel's Hill by Osamu Tezuka, a cute shoujo manga published in 1960. Something a bit different than Happy, although maybe not completely since Urasawa, like pretty much every mangaka ever, was heavily influenced by Tezuka.
This is a joint between us and twopioneers, who is translating this for us in addition to the very awesome Tezuka series The Crater. I highly recommend grabbing that off his blog, it's definitely worth a read.