天空のロザリオ

One day while you are walking through town, you happen to spot a curious power stone in the window of a random goods shop. You brought to a mysterious world on your way home after getting a hold of a power stone. Handsome angels appear in front of you in this strange world where your life is being targeted! They tell you that they want your help to defeat the traitor Arch Angel Lucifer! You choose one of the four angels to be your bodyguard on your journey. Will you be able to defeat the Arch Angel Lucifer and safely return to your own world?

[from Google Play]