Hero was a high schooler living an ordinary life.

One day, he meets a very strong and intelligent mechanical arm named "Mecha-ude". After a strange turn of events, the "Mecha-ude" started living inside Hero's hoodie and the two's life full of trouble begins.

As the boy and his "Mecha-ude" fights together and strengthen their bonds, the two also meets new friends who also fights along with each of their own unique "Mecha-ude" partners.

Out of those, one of the heroine has two "Mecha-ude" which appears out of her skirt. An active girl with a totally opposite characteristics from hero himself, he gradually becomes attracted to her.

But the two are confronted with other "Mecha-ude" users who are in search of the secret of "Mecha-ude" relentlessly.

[Source: kickstarter]

One day, Amatsuga Hikaru, a junior high school student living in Kitakagami City, meets the mysterious "Ude"-shaped mechanical life form Alma. Alma attempts to bind to Hikaru's body in order to obtain energy from him, but fails. To his surprise, it binds to the hoodie that Hikaru was wearing. Meanwhile, the "Kagami Group," a large corporation that plans to enslave the Mecha-Udes and turn them into weapons, is in pursuit of Alma. ARMS, an organization working to save and free the Mecha-Udes, also searches for Alma. Hikaru, unable to abandon the weakened Alma, puts on the hoodie that Alma has bonded with and gets caught up in the great events unfolding among the Mecha-Ude users......

[Source: official website]