Different problem than what anon said.
For an ending to be satisfactory, there has to be growth. The character rises above their earlier station in life through the journey depicted in the story.
And japs, man, they don't rise. They fall into their designated roles.
Take PS. Boys in an all fem high school, tortured, locked up, tortured more, looked down upon.
Do they hold any resentment?
Do they try to take over?
Do they end up running the school and making queen manhater their bitch?
No. They stay right where they fucking were at the start, more or less.
How can something like that be fucking satisfactory?