(まじですかスカ!, Maji Desu ka Suka!, Seriously, Ska!?)

is the 45th single of the Japanese group Morning Musume, released on April 6, 2011 on the Zetima record label.

is the first single to feature Morning Musume's ninth generation, Mizuki Fukumura, Erina Ikuta, Riho Sayashi and Kanon Suzuki, since their addition to the group in January 2011, and the first following the departures of Eri Kamei, Junjun and Linlin, who graduated in December 2010.

[4] All limited editions and the first press of the regular edition sport different covers and contain a serial number card, which could be used to enter a draw to win release event tickets.

Project's weekly variety show, aired the first preview of the song.