ただの風のいたずらだよ。

ordinary; common; usual; free of charge; unaffected; as is; safe; only; merely; just; simply; but; however; nevertheless

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

wind; breeze; draught; draft; manner; behaviour; behavior; cold; influenza

mischief; prank; trick; practical joke; pastime; hobby; playing with (a lighter, etc.); fooling around with; messing around with; amusing oneself with; tampering with; lewd behaviour; sexual misconduct; sexual assault; molestation; rape

be; is; indicates past or completed action; indicates light imperative

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!