Amber Souls: Ballads of Yggdrasil

7 heroes have been bound together since the beginning of time, going into another dimension to stop the manifestations of the seven deadly sins from reaching earth, but now it seems that they've made it here while all 7 had been presumed dead. now, a Previously thought dead member mentors an unconventional team of 7 teenagers trying to take down the living embodiment of the 7 sins and their minions, using the power of the world tree Yggdrasil, which resides under the run-down public zoo of a small unnamed city in Japan, each hero using powers based on their interests and aspirations.