Whats this about a 'sequel'? Can anyone explain? Is this manga complete?

the last update "chapter 26" here is the last chapter of volume 6, which is not uploaded here - though you can buy a translated copy online. there is a volume 7 that serves as the "final finale" and concludes the story for good, but i guess it is not translated yet, since it came out in 2019.

Thanksss XD ... Was sooo confused