This is a posable, high-grade or better injection-plastic kit of an item from the Gundam universe.
Here's the 'J' version of the Beginning Gundam from Gunpla Builders. Featuring the same great design and amazing articulation as the previous Beginning Gundam (linked below) this is indeed one of Bandai's HG marvels. The J comes with its Burning J Swords which can attach together to form one lengthy double-bladed weapon or even be attached to the J's backpack. Marking stickers and effect parts are included, too!