If you liked
FLCL
|
...then you might like
Yofukashi no Uta
|
Both have the same plot: Middle school boy effectively leaves aside school to hang out with a supernatural, eccentric older woman with a considerably less mature personality than the kid who takes him into all kinds of things in what he sees as a way to appear "grown up" but she is actually just a toxic influence on him.
Similar themes of middleschool boys navigating their sexuality with eccentric older women.