Quick answer — Nanatsu Mukunoki worked on WATATEN!: an Angel Flew Down to Me -Precious Friends- (Original Creator), WATATEN!: an Angel Flew Down to Me: You Never Let Us Down / Always Growing Closer / Let's Change You Into This! / I'm Your Big Sister (Original Creator), WATATEN!: an Angel Flew Down to Me (Original Creator).
Nanatsu Mukunoki worked on WATATEN!: an Angel Flew Down to Me -Precious Friends- (Original Creator), WATATEN!: an Angel Flew Down to Me: You Never Let Us Down / Always Growing Closer / Let's Change You Into This! / I'm Your Big Sister (Original Creator), WATATEN!: an Angel Flew Down to Me (Original Creator).
