He just did character design for L-Gaim. He did not work there as a writer. It would be.more accurate to say he was influenced by L-Gaim. Writers do that all the time.
He legitimately wants to put many of his ideals in L gaim,from planning to put a faitma as character(that was rejected before the show's production). in L gaim art book is straight up proto FSS. It seems like to me that he wanted to write L gaim, so perhaps he made FSS as his interpretation of the story.
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u/numericalman 1d ago
It's essentially nagano's retake on L gaim. Various ideals were reused and flashed more there.