Place it at the start of a confused beat, then follow with Anime Ahh when the surprise grows, or Eh Eh Ehhhh when the doubt turns playful. For a shy anime exchange, pair it before Tuturu so the small question sets up the brighter greeting that follows.
O tym dźwięku
This is a very short questioning hum from Hachiware, lasting about a second, with a soft rising 'mm?' that sounds unsure and curious. It feels gently puzzled rather than alarmed, like a small pause while someone works out what they just heard. The light, cute delivery makes it easy to read as confusion, hesitation or a polite request for clarification.