There's quite a few stores online with Japanese style stuff.
But these tees in particular stood out to me.
Kente Graffiti Boy Tee and
Kente Brain Drain Tee. I like the graphics on them and they have that crisp Japanese style too.
Looks like this brand mainly does collaborations so I'm not sure if its a brand that is totally dedicated to Japanese style stuff. The good thing about them though is their prices are extremely reasonable (I bought both tees
)
Here's a link to their website
Cross Culture Project