Spoiler
I was absolutely mind fucked that the whole reason why Wataru Minakami was sent to the place where the story revolved around was an attempt to "straighten" him out as he was turning gay being enrolled at an all boys school. To which I was kinda annoyed because the anime then was stating the old "assumption" that homosexuality is a choice & that a homosexual can be turned straight provided he/or she was subjected to a heterosexual environment, which may work for others, but if the protagonist was truly gay, you can put him in a room full of women but it wouldn't do squat to him.
Spoiler
Not exactly the ending per se, but the episodes leading to it. After all the trouble the Gothamites.... no this isn't Batman OK, left their planet to find a new home then finding, ruining & conquering the Earth, it turns out their savior leader was actually an incompetent pompous asshole who ultimately led their race's extinction.(
Spoiler
Really!? Giving up all that magical power to save your arch nemesis' life who is not only a total bitch but isn't exactly your friend.
Spoiler
You already have the means to fulfill your wildest dream & you throw it all away because you don't want to part ways with the one who'll fulfill it for you
