I wish I could go into a hole with 穴があったら入りたい

Idiom Explanation: Feeling greatly embarrassed with 穴があったら入りたい

To avoid being spotted by classmates while on a date at the aquarium, Mie switches to calling Komura by his given name. Komura tries to do the same, but is unable to. They stop by to see an otter. Hearing the otter’s name is Ai-chan, Komura realizes he can practice saying Mie’s given name, Ai, without embarrassment if he’s addressing an otter. After Komura greatly compliments Ai-chan, the otter, on how cute she is, he realizes he’s embarrassed Mie, embarrassing himself at the realization.

小村(こむら):: 「穴(あな)があったら入(はい)りたい」; “I wish there was a hole I could go into...”; Literal: “If there were a hole, I would want to go in.”

There’s a visual play here, as the otter is going into a hole, something Komura himself is unable to do.

Key Points

1穴があったら入りたい expresses intense embarrassment

Literally, the phrase means “if there were a hole, I would want to enter it.”
Idiomatically, Komura wishes he could disappear because he is so embarrassed.

2あったら sets a hypothetical escape

あったら is the conditional form of ある, meaning if there were.
The sentence imagines a convenient hole that does not actually exist for Komura.

3The panel makes the idiom visual

The otter can go into a hole, while Komura can only wish for one.
That contrast makes the stock expression fit the aquarium scene especially closely.