Charlotte (シャーロット) ED2 - Rakuen Made (楽園まで) - piano version 

Let's be friends :3 / joshagarradomusic
Sheet music (will unlock at 20,000 views)
Ending theme, version Misa. Sounds pretty badass
It's a different singer, but somehow it feels like Girls Dead Monster has returned...
The TV version doesn't really have an ending so I made up one of my own. Maybe you'll recognize it ;) (Still one of my favorite songs ever)
Also, poor imouto-chan is totally going to get killed off, isn't she? So many death flags ._.