These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The intro to episode 12; the world is close to being destroyed, and it reflects that.
Jennifer: Well, we've taken a lot of byroads, but this long, yet short, ugly, yet beautiful story is coming to an end. Thanks for watching it all the way through. Bye, now~
Stop Helping Me!: Hikari gets a big one of these from Mari during the beach episode.
Tear Jerker: There are moments where the series comes darn close by any criteria. For example: Takeru's childhood abandonment, the sheer desperation of Akira and Hikari in the final episodes, and the quasi Downer Ending.
The Woobie: Both Hikari & Akari when they are tortured by the reality of their true mission on Earth (to decide whether or not to destroy the planet).