Today Nerutan posted his last entry at his blog. He decided to quit all Nico Nico Douga activities (delete twitter, blog, not uploading any covers anymore nor taking part in lives, even not comming to play with Asamack). This time it's his individual choice because he was lacking motivation and wants to devote himself fully to his real life. It's his final decision (it means he's not just on hiatus). Nothing bad happend to him thought, he's still his usual genki self.
Source: http://0system.blog58.fc2.com/blog-entry-47.html (he might delete it with the end of September)
Personally I will miss him. His parody covers with Gero was first ones I found and got into nico nico douga. He was always precious member of Asamack family for me. And he was one of the oldest utaite, I think he joined 6,5 years ago. But I want to respect his decission...