a few weeks ago there was an event with undead corporation, so from the event tab you could play every song. sometimes the songs come to the shop and they're pretty cheap
There is an event or he/she just got some copies of the songs *I only have flowering night fever guitar instrument, embraced by the flame (English ver), everything will freeze easy,normal,hard, sad dream* Edit: I’m not actually good at hard songs but maybe practice and practice I will get better