Nyangen could be a pun on Ningen but with the cat affectation of Nyan+* ,
If so , it could be a pun meant to go both ways depending on "who is saying 'goodbye'/who*it's directed at .
* manga title was like one word
* Setting : japan
* genre : psychological (sorta)
* Story starts about some guy checking out some seaside village for some reason
* village elder ( male ) says women are in charge
* meets some ex-covicty dude
* diving for peals or something ?
* they oversee...