Toaru Majutsu No Index: Struggle Battle

とある魔術のインデックスストラグルバトル , A Certain Magical Index Struggle Battle

Summary:

An online social game by Mobage, which was released for iOS devices, Android devices, and mobile phones based on the Toaru Majutsu No Index franchise.

Storyline:

It's about a player with the ability known as Imagine Shadow. Usamimi uses the player's unique power through the use of Boosters. She enlists the player to become the strongest in Academy City, but she shows her true colors, wanting magic and esper powers herself, breaking the pact between the magic and science, leading to her being targeted by both sides.