Fans who purchase 3,000 Yen worth of GRANRODEO's releases at GRANRODEO LIVE TOUR 2023 “Escape from the Iron cage” concert venue/s will receive 1 postcard as a bonus item
3 designs are issued , while stocks last & the postcard's given randomly
https://twitter.com/GR_staff/status/1692461582364586374
https://granrodeo.net/contents/665201