The design inspiration for the "Artist Support Item Hand Model" comes from the hands drawn by Kakami, an artist whose hand-drawing reference books are highly acclaimed in the Japanese animation and illustration industry. The prototype was created by Shirohige Hajime, a sculptor who has been active at Kotobukiya for 20 years, with Kakami himself supervising the entire process.

By fully applying Kotobukiya's expertise in modeling and joint technology, the model recreates the "Golden Ratio Hand" — ideal proportions and movements that even observing one's own hand may not reveal. Kakami's two-dimensional artworks are praised as "divine drawings," and their exquisite balance has been analyzed from every angle and incorporated into the three-dimensional sculpture, giving it a striking sense of realism.