It appears to be some sort of web series. It either must be discussing various things on the web, or some sort of modernization with random characters. Frankly I love most of the characters, especially L.
Huang Long
Kirisame Marisa from TouhouChang Wai-Shan
Mr. Chang from Black LagoonKashiwazaki Yaranaio
YaranaioMinase Youmu
Konpaku Youmu from TouhouMinase Yuyuko
Saigyouji Yuyuko from TouhouRyuuzaki L
L from Death NoteInogashira Gorou
Inogashira Gorou from Kodoku no GourmetOfficer Higa
Higa Akira from The Outer ZoneNarumi Reimu
Hakurei Reimu from TouhouAkihabara Yaruo
Yaruo