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.

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