星の王女　光のつばさ（Hoshi no Oujo: Hikari no Tsubasa）

A group of friends who belonged to a band one day got into a big fight.
Although it didn't develop into a serious incident, the student counsel president found out and the band was in danger of having it's action's suspended.
However they managed to overcome many obstacles and the school recognized them and allowed them to go on a live tour.
Suddenly the bus they were riding on was enveloped in light!

When they regained consciousness the world before their eyes was one they had never seen before. It was obvious that the town-scape before them wasn't the present day. They were being looked down upon by soldiers stationed at a towering palace. They knew nothing about this first place they arrived at, the city wrapped in rainbows Reikru. Then an old magician appeared and told them the reason they were led to this world. In order to save the future of this world, the 15 of them were summoned.

Without a care for the importance of the mission they were chosen for, the noisy group packed up all their various sad and happy thoughts and set off on an adventure in their cart pulled by the holy wolf "Noah".

On that journey they met a member of the sacred elf tripe "Noel".
They were captured by bandits and met an ominous man who was maybe an enemy or maybe an ally "Geil". They also met a cult who dressed all in black robes.

The group of 15 friends who were wrapped up in various incidents cheerfully weathered the storm.
With pounding excitement they all rode together on a journey.

[Translated from the official site]