Place it at the start of an outdoor summer scene, before dialogue or music, then follow it with Anime Wow when a character reacts to the heat or a surprising sight. That order keeps the setting clear first and lets the reaction land second, without crowding the opening.
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This is a short, about-one-second cicada chirp, a bright, high-pitched buzz that rises and falls like insects calling on a hot afternoon. It feels warm, drowsy and unmistakably summery, with a light, playful edge that suits a lazy day rather than a tense scene. The clip comes from Muromi-san.