Brilliant lovely Excel chiffon

Nagetsu Mikihara and Fukafuyu Kisaragi encounter a mysterious light floating in the air while they are out of school one day.
The light spoke to them.
He said, the world is approaching a crisis, so I want him to fight instead of himself ....
It was a puzzling two people, but soon a mysterious group appeared in the city as the mysterious light said and began to rampage.
Using the power granted, Natsuki and Fukafuyu throw themselves into the battle against the "Energoa Empire" that suddenly appeared from another world.
To protect this world from invasion!

御木原菜月と如月深冬の二人はある日の下校中、宙に浮かぶ不思議な光と遭遇する。
その光は二人に話しかけてきた。
曰く、世界に危機が迫っているので自分の代わりに戦ってほしいと――。
戸惑う二人だったが、ほどなくして不思議な光が言った通り街に謎の集団が現れ暴れ始めた。
授けられた力を用い、菜月と深冬は異世界から突如現れた『エネルゴア帝国』との戦いに身を投じていく。
この世界を侵略から守るために！