There is a dedicated museum in Sakai as well apparently:

"Shimano Reel Museum (Sakai, Japan): Situated in Sakai, Japan, the Shimano Reel Museum offers a unique look at the history of fishing reels, with a particular focus on the innovations of Shimano, one of the world’s leading tackle manufacturers. " https://oldfishingluresandtackle.com/fishing-tackle-museums-...

As a cyclist, the first time I saw Shimano fishing rods took me by surprise too, although it makes (some) sense. Lightweight tubes, smooth bearings, mechanical spinning things are common in both industries. Also amuses me in the same way when I see a Suzuki outboard motor or a Honda lawnmower.