Heartwarming / Gate Keepers 21

• Just about any time Miu and Yukino are together, mostly when Invaders aren't trying to kill them.
  • Like in episode 5, "Miu". When Miu gave Yukino a uniform to help her blend in better with the civilians.
• Episode 6, Ayane stepping up to defend an unconscious Miu from Ghost Girl.
  • When Miu is reunited with her friends during the finale just after the Big Bad had accidently restored the area and all the people she'd killed in it. The look of relief on her face as she hugs them was priceless.
  • Really, seeing all the people who had either been killed, such as Yukino. Or those turned into Invaders be restored was heartwarming.