الحلقة 1: تحضر ست وحدات إلى مهرجان الموسيقى النادر U4 Fes رغم غياب عنوان الإرجاع

1

The six units are introduced at the Unknown Underground Unbelievable Ultimate Fes. (U4 Fes.), a mysterious music festival that takes place once every 100 years. Happy Around! receives its invitation in the mail, and although the four agree to participate, Rei notices the lack of a return address. (Source: Wikipedia)