Netotte Megami!

Being saved by a girl named Arne, the amnesic protagonist try to recover.
But one day, a god hero named Vidar, looking for a being called Fenrir, threaten to destroy all towns on his way until he get his target out of hiding.
The protagonist try to oppose him, but don't have the power.

His only chance is to try to get on his side the 3 goddess that accompany Vidar.