And it's not even a full site, just a page on Gangan Online to let fans know a series is coming. The official site is going to be watamote.jp, but that's just a blank page right now.
What is impressive is that the latest volume of the manga has
sold 172,000 copies. For comparison, the latest volume of Daily Lives of High School Boys (Gangan Online's biggest title) came out on the same day and is at 182,000 copies.