On mobile, but Junko says, "You watching!?" and "Are you watching!?"

Hecatia enthusiastically thinks something is good. Most likely, just everything in general. Casual speech. I'd translate it as, "I'm good!" or "everything's good!"

I THINK Reisen is saying, "piece of cake" up top. Second panel is definitely, "oh shit..." or "not good..."

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Helepolis said:

The image doesn't meet the requirements for the pool, don't you think? She's not calling out to her if we purely go by the pool requirements.

It's implied that she is calling out to Chang'e.

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We know that she's probably calling Chang'e, but it's not that obvious from just this picture alone. If we go by the rule of thumb, it shouldn't be in the pool.

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