Honestly kinda at the point of dropping this, it's like it's trying to jump the shark every new chapter.
Well the end is only 1-2 volumes away, so there is no point dropping it now.
But yes, the story has really gone downhill. Which pains me a lot because during the astronaut training this manga was legit in my all-time Top 10 (and by that point I had read well over 4,000 manga). When the author decided to sideline Serika, Kenji, Nitta & Ena for the new characters whose names I can‘t bother to remember, I already felt a disconnect with the characters. But at least the story was still kinda good.
But now… it‘s just pain. And the fact that we won‘t get to see a full-fledged Mars mission (which was hinted at multiple times throughout the series) is the final nail in the coffin.
So many long-running manga go down the drain after a while. And I don‘t know why.