Included in the BD/DVD Vol.6: 
SHORT TRACK / ロボットは銭湯の夢を見るか (Short Track / Do Robots Dream of Bathhouses?)

AD 2072. With the invention of cross-dimensional electromagnetic inductors known as Coils, the world's energy crisis has long been solved. Kyouma Mabuchi is a "Collector," someone who makes his living by recovering illegal Coils for the powers that be. When on his latest gig he crosses paths with a mysterious girl named Mira, little does he know that their meeting will bring them both closer to the secrets behind "Dimension W," the fourth dimension--beyond X, Y, and Z--that powers the world... So begins this progressive sci-fi tale, where the future of science and humanity may very well hang in the balance!
 
(Source: Yen Press)

In the year 2071, the world's energy problems seem solved by a network of cross-dimensional electric-field inductors- "coils" -that extract energy from a seemingly infinite source. That source is the W dimension, a fourth plane that exists beyond the X, Y, and Z dimensions. 
 
In this world, unofficial "illegal" coils harness powers that the police can't hope to counter. Dealing with these coils is the job of coil-hating repo man Kyoma, whose run-in with the unique coil android Mira leads the two to form a reluctant partnership. 
 
(Source: FUNimation)

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