This happens as soon as I take my eyes off you with 目を離す

Idiom Explanation: Averting one's attention with 目を離す

During a trip on a train, Conan accidentally overhears that there is a bomb on the train, and it’s set to go off. Conan tries to follow the criminals as they disembark, but Ran stops him at the exit door.

コナン:: 「あーーー」; “Ah...!”
蘭(らん):: 「もぉ！目(め)を離(はな)すとすぐこれなんだから！」; “Geez! As soon as I take my eyes off you, this happens!”

Key Points

目(め)を離(はな)す = to take one’s eyes off someone
- In this scene it means Ran stopped watching Conan closely for a moment.
- The idiom is about losing visual attention, not literally removing your eyes.
〜と marks a regular consequence
- 「目(め)を離(はな)すとすぐこれ」 means “as soon as I take my eyes off you, this happens right away”.
- 〜と often presents something as the natural or repeated result of the first action.
これ points to the trouble in front of her
- これ does not name the problem directly.
- It works like “this mess again”, relying on the immediate situation for meaning.