Crews Maniac Sound is a Japanese guitar company based in Tokyo, founded by Kikuo Yoshioka, who started the business in the early 1980s as a small shop dealing in guitar parts before expanding into full instrument production. The company describes itself as "a crew of musicians, building what we believe in," and operates retail shops in Shibuya and Higashi-Koganei alongside its manufacturing and custom-order operations.

The brand produces electric guitars, basses, electro-acoustics, and effects pedals, with production carried out in Japan by builders including Terada and Deviser (also known for Bacchus). Their catalog centers on traditional solid-body designs — Les Paul-style LS and LC models, Stratocaster- and Telecaster-inspired shapes, and SG-style instruments — often available through semi-custom ordering. Higher-end models feature nitrocellulose finishes, selected tonewoods, and boutique pickups including K&T. The KTR sub-line, commissioned through MusicLand Key in Tokyo, is a well-known variant series within the catalog.

Alongside the main guitar line, Crews runs a secondary amplifier and gear brand called 6Turns, and distributes imported boutique products such as Evidence Audio cables and Fjord Fuzz pedals. The company has collaborated on signature instruments with Japanese players including bassist Kentaro Nakao.

Crews Maniac Sound has 20 products cataloged on Equipboard, including Electric Basses, Solid Body Electric Guitars, and Acoustic-Electric Guitars. Their gear is featured by 5 artists, with the strongest followings in Rock. Notable users include Kentaro Nakao, Pete Thorn, and Yamazaki Hirokazu.