ファフナーのシナジェティックスーツ(１期)だ。極めて便利(意味深)だ。

It's the synergetic suit from Fafner (1st season). It looks extremely convenient (in more ways than one).

"Sōkyū no Fafunā / Fafner in the Azure":https://en.wikipedia.org/wiki/Fafner_in_the_Azure