Elf o Karu Mono-tachi

The story begins in a fantasy world, where three people – Airi, Ritsuko and Junpei – have been mysteriously teleported to (along with a type 74 tank). Since their presence could cause chaos in their world, the Elves decided to send them back. The ceremony is performed by the Elves' slightly psychotic leader, Celsia Marie Claire. The ceremony goes well, up until the very end when Junpei's unflattering comments push Celsia over the edge. She loses her focus and the incantation vanishes, separated in fragments, which the gang will have to find if they want to go back to their world. The only problem is that the fragments are etched on the skin of Elves, who may not want to submit to the scrutiny of our friends.

[From Anidb]