My Hero Academia. There's just something about the earnestness of the protagonist that warms my heart and brings a tear to my eye. 君はヒーロになれる has to be one of the greatest moments of shounen battle.
On the opposite end of the spectrum, Schwarzesmarken totally failed at making me care about any of the characters and their tragic ends, which I understood to be the core strength of the Muv-Luv franchise (PTSD arc etc).