Grimgar of Fantasy and Ash

An anime original episode included in the first BD/DVD volume of Hai to Gensou no Grimgar.

When a classroom of students is transported to another world to act as its saviors, Hajime Nagumo finds himself the weakest link. As his friends and classmates are granted strong classes and impressive abilities due to their existing skills, he is given the weak title of Synergist. When a dungeon quest leaves him separated from his group, Hajime must discover his own talents or be left to rot in this world forever.

Was going back to school at night to retrieve a forgotten lunch box a really bad mistake? That's how it seems when Mangetsu Kohinata suddenly finds herself pulled into a strange world where girls in giant magical armor are engaged in a ferocious battle. While the timing was unfortunate, it turns out that Mangetsu's arrival in this strange realm was anything but a mistake, because Mangetsu appears to be a mage herself! Now, with the help of her mysterious new friend Shingetsu, Mangetsu must learn how to summon and control her own giant armor as they fight against other mages in a competition with an unbelievable prize - control of the lost magic that once ruled our planet!

Dreaming of a magical world every night, the young Toramizu Ginta yearns to be able to go there. With only his friend Koyuki believing in his dreams, Ginta remains positive despite the slander he receives from others over his dreams. But his wishes are answered, as one day a large door appears in front of Ginta, summoning him to the land of MAR Heaven. In this land, the weapons known as ARMS exist. While initially Ginta greatly enjoyed the discovery of this magical world, he soon learns of the terrible wars that have once plagued MAR Heaven and the upcoming war that may soon appear.