Responses
86 is probably the total amount of its chapter, include extra chapter
Sometimes a story will get marked completed if the author is finished writing. That doesn't mean all of the chapters have been translated and uploaded, just that there is not going to be new releases in the country of origin. Also, some readers will count extras as additional chapters, while some people will number them 1.1, 1.2 and so forth.
For the manga daytime shooting star it says its compleated with the 78 chapter on mangago, but on other sites it says it has 86 chapter? Which one is it?