自作自演

じさくじえんjisakujien

noun · suru verb

1. performing a part in one's own play
2. playing a musical piece that one has written
3. doing everything by oneself (from preparation to execution)
4. put-up job
5. charade
6. sock-puppeting (i.e. pretending to be more than one person on the Internet)

Study it in Yanamino