Re. Chaos;Head, Chaos;Child does give some spoilers but not ebough that you couldn't happily play Chaos;Head afterwards if you wanted. The only English version if Chaos;Head is on PC with a fan translation (and finding exactly the right files wqs a slog but I got there in the end). I played them in release order.|
As for Child, You shouldn't need a guide until you have all the routes bar two I think (true route and the one before) then IIRC you may need it for choices (then again it has been a while ao you possibly didn't). If they haven't patched it there is one scene with an interactive map that was still in Japanese that you might want a guide for (I would have read the Japanese and managed without but was on Vita and it was the only time the magnifying glass didn't work annoyingly).
#12177533, By One_Vurfed_Gwrx Official UK Playstation Vita Store Thread
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