Hi. Another one here that come in looking forward to see more Aria likes works. Amachu is more a Yuri anime than a Iyashikei. Aria was more like a Iyashikei with light Yuri elements, more like fanservice here and there than anything else. In Aria male characters had an actual "face", so yes, this is a detail that sends a clear message. Dynamically, if follows the lead girl, Futaba-chan personal narrative on how her partner Pikari leads her out of her social enclosement. Diving element are somewhat scarce, it's not a diving anime, really, but the girls looks cute in the suits. It's probably a 6.5 Iwas looking forward for pure Iyashikei, and for that to happen, less strong emotional blasts and way more environmental focus slice is totally required.
I will leave a 7 here because I believe that Futaba's narrative has allegoric elements an peaks that are really good and well done.