The Xi: unidentified flying objects that are vastly more powerful than humanity's best fighters. Kei Narutani is fleeing Shanghai on an evacuation ship when he's attacked by the Xi, but a mysterious red fighter jet saves him. One day in his new home in Komatsu, he sees the same jet. It's being carried to a nearby Japanese air-force base.
And if I'm not busy, I'm going 
to start thinking about things.
إن لم أشغل نفسي، فسأبدأ 
.في الّتفكير في بعض الأشياء
Und wenn ich nichts mache,
dann denke ich nur unnötig nach.
Y si no estoy ocupada,
empiezo a pensar cosas.
Y si no me mantengo ocupada,
comienzo a comerme la cabeza.
Et si je ne m’affaire pas,
je risque de cogiter.
E poi, se non mi tengo impegnata,
inizio a pensare a quelle cose.
E se eu não ocupar a mente,
começo a pensar bobagem.
А ещё, когда не работаешь,
в голову лезет всякое.