Per wiki policy, Spoilers Off applies here and all spoilers are unmarked. You Have Been Warned.

Tsurumi seeing through Yukiatsu and how he crossdressed as Menma.
Yukiatsu saving Anaru from a man who was forcing her to go to a love hotel.
Jintan standing up for Anaru when their classmates start spreading rumors about her being in a love hotel with a man.
Jintan working two jobs, at Anaru's job and as a construction worker, to fulfill a possible wish by Menma.
Even though it wasn't the real wish Menma wanted granted, the rocket launch in episode 10 is still pretty awesome.

Awesome / Anohana: The Flower We Saw That Day