Attack on Frozen

Eren Jaeger used to be very close to his older sister, Mikasa. But, after a night of cheer and fun, he was suddenly shut out by her the following morning after blacking out. Many years later, Mikasa is crowned the commander of the branches of Military, and a party that started off great turns a twisted path when Mikasa loses it. Eren now must set off, with the help of a strange man and his trusty horse, to find his sister and help reverse what she has caused.