Shoko is a student at Ryuusei Private Academy Middle School. Her dear sister, Kyoko, had went to study abroad five years ago and hasn’t heard from her since. One day, an unknown entity suddenly attacks Shoko. The ones who attacked her had been the Dryads, underlings of the evil goddess, Eris, who was once sealed by Goddess Athena. When Shoko and Saori Kido awaiting the Galaxian Wars meet, the gears of destiny begin to turn!
Tonight will be the day our great
Eris-sama is resurrected!
!الليلة ستكون الليلة التي سيعاد فيها بعث إيريس-ساما العظيمة
Heute ist der große Tag,
an dem Eris-sama zurückkehrt!
Esta noche
la gran señora Eris resucitará.
Esta noche
la gran señora Erin resucitará.
Cette nuit, l’illustre Éris
reviendra parmi nous !
Stanotte finalmente 
la grande Eris tornerà in vita!
Esta noite marcará o renascimento
da nossa grande mãe Éris!
Этот вечер станет днём
возрождения нашей великой Эрис!