Cross-Over by Matsui Yuusei Wallpaper
Mangaka: Matsui Yuusei, Uploaded by Yuuhiroo Oct 04, 2012,
Matsui Yuusei, Saiki Kusuo no Sainan, Ansatsu Kyoushitsu, Saiki Kusuo, Koro-sensei, Kaidou Shun, Nendou Riki, Tentacles, Calendar (Source), Wallpaper, Scan, Magazine (Source)