Where are you at with いんの
Grammar Explanation: Contracting いる+の to いんの

Azu is with her friends, waiting for Suwa. They call him to find what’s keeping him, and while Azu talks with Suwa by phone, she hears an echo of his voice in the distance.
- あずさ:
- 「須和? 今
( どこにいんの?」- “Suwa? Where is it you're at right now?”
- 須和
( : - 「じゃあ もう切
( る」- “Well, I'm hanging up now.”
- あずさ:
- 「えっ」
- “Eh?”
Key Points
いんの = casual contraction of いるの
「どこにいんの」 is a spoken shortening of どこにいるの.
This kind of contraction is common in casual conversation and can sound softer and more natural than the full form.
Particle choice: どこに
に marks the place where someone exists or is located.
So どこにいる means “to be at what place”.
See Also
- Grammar: Reasoning with 〜のだ