This OVA is a direct sequel to the first season of Amanchu! It came out over a year ago, but I only watched it this April, when I was readying myself to watch the second season, Amanchu! Advance, which aired in the spring.
As always, beware of spoilers!
The premise is very simple. Futaba/Teko’s two closest friends from the city come to visit her. Chizuru is jealous of Hikari/Pikari and lets that spoil most of her visit. (Even though Pikari’s grandma warns her in a way. Listen to your elders.) In an apology that leaves nobody wondering what happened, she accepts that Futaba/Teko can have other friends and be happy with them.
First off, please accept that I’ll be calling the main characters by their nicknames, Teko and Pikari. Which is one of the things that bother Chizuru.
Chizuru expected Teko to be all lonely and alone. (Which she was in the beginning of the first season.) Instead she found herself Pikari and the diving club. She has a C-card now and pictures of her new friends mixed in with her photos from the city.
Pikari is very welcoming and the best guide of the region they could wish for—from dining to diving. She picks them up with her grandma, catches Chizuru (below), is her diving partner and finally accepts her apology in the end. Chizuru, unlike Akane, takes a day to accept Pikari.
Poor Akane-chan barely gets any lines. She is always there, with her knowing smile, but Chizuru and her inner dilemma get all the attention of the camera.
The diving experience is the high point of the OVA. The pacing is perfect and the world underwater is beautiful. Even I noticed the music (and I’m not an auditory person at all) reminiscent of a church choir. Really, the view upwards was like looking up to the ceiling of a cathedral. Or better yet, through a stained-glass window of a basilica.
The story I just recounted is a little strained and too “tell, not show”. Especially the ending is quite rushed.
What is nice though is how Chizuru spells it out for the viewers that Teko has changed. It was a gradual change, but she’s a different person now.
Regarding animation, I can’t write anything I haven’t written before. It’s the same as in the first season. From my short (backlog) review of it:
As for the animation, the CG is visible. […] The character expressions and cats are particular. If, in five years, you show me a shot of Pikari’s googly eyes or Teko’s delta mouth or the ass cat, I’ll know.
Bottom line: I rate this OVA 5/10, so “average”. While the animation is just as good as of the series, maybe even better, the story is lacking.