Q.E.D. iff: Shoumei Shuuryou  

QED, Quod Erat Demonstrandum if and only if, Shomei Shuryo, Q.E.D. iff ―証明終了―, Q.E.D. iff ซึ่งต้องพิสูจน์

The continuation of the Q.E.D. series under Shounen Magazine R.