The contradictory impulse of wanting to understand and love people while simultaneously being scared of them understanding you. Essentially, the hedgehog dilemma. Each of the characters wants to love and be loved. They want genuine human connection. But they’re also terrified of being rejected by others or being abandoned. AT fields, the energy shield thing, are literally “Absolute Terror” fields that exist to prevent people from getting close to you. Angels just have a beefed up version that can block physical matter rather than just emotions.
The last few episodes get metaphorical but essentially the message is “Start with loving yourself.” Everything with the mechs and angels is cool but not really relevant to the meaning of the series.
Windows Vista on my old family desktop.
First Linux distro, if it counts, was the Raspberry Pi OS