Hikaru’s ordinary middle school life takes a thrilling turn when he encounters Alma, an alien entity resembling a mechanized limb called Mecha-Ude. Alma, a member of a rare species, is fleeing from a sinister group hunting their kind down in search of one possessing unparalleled power. Tasked by the resistance group ARMS, this unlikely duo will embark on a perilous journey to save the Mecha-Ude.

[Source: Crunchyroll]

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]

The story is set in Nagasaki prefecture in Minami Shimabara city, the fabled origin of the Shimabara Rebellion that sent shockwaves through all of Japan in the early Edo period. It is also where a third-year junior high school student named Shirou spends his days with his school friends.

One summer day, Shirou's older childhood friend Akane returns to Minami Shimabara from Tokyo. Shirou and Akane take a stroll around Minami Shimabara with another longtime friend, Tokiya. While these friends are dealing with nostalgia and more complex feelings, a mysterious creature named Goron suddenly appears before them. This encounter with a mere little creature causes great events to unfold once more in this city...

[Source: Anime News Network]