When I saw the clues of "date" (12 May) and "over earting" I somehow got a feeling that it could only be three things: 1- The date would be a japanese pun about numbers. 2- It would represent some holiday date (even ancient or modern) or 3- It would be related to birthday party!
Like if it was "every Tuesday" or "every "24:00 on the clock" it would be a shorter cycle, but why a specific date that happens once a year? It felt specific.
On the chapter itself, I love how balanced their dynamic is, both emotionally (Azu is confident and relaxed while the Kino is a scaredy-cat) and in terms of power (Azu is physically strong to get things done while Kino can heal her), but there's even some hints like Azu only caring about Kino and nobody else (probably some backstory element yet to be revealed... on top of their origins hinted in Chapter 1).
This is an episodic story so far but the stories are amusing and there's some overarching elements to look forward to.
Just a minor design nitpick for me going forward, I kinda wish the author used the old SIA uniform of them that they posted on twitter as their everyday garments for investigations like these.
Sure, the suits sort of make sense in the first chapter but here it just looks out of place man.
Nah the wetsuits being the "first penguin" parallel makes it more iconic than regular work suits.