Beyblade in japan

I am soon visiting Japan (trip will also take place during 3/21). That made me think, is there anything in particular worth visiting in japan in relation to beyblade? examples can be beyblade focused stores or stores with large enough selection to justify a visit, amazing bargins, vintage or old products (stores selling MFB or older), tournaments, release events for GENX or just anything interesting that you want to mention even ifits just something cool and beyblade related about japan (in aspect of places to visit or things to do)