Great stuff. Besides the overall pleasant, homey feeling from watching it, I liked the growth of the main heroine as a character.spoilers
Here's a very good tsundere, in my opinion. Moreover, this prickly personality type isn't just for fanservice — the reasons are clearly shown: a reclusive lifestyle with an overprotective grandmother, a sense of inferiority, an inability to talk to people, and a constant feeling that everyone around you is your enemy and wants to hurt you. But all of that grows past itself, and she turns out to be an incredibly reliable and understanding girl by the end.
On the other hand, we have the main hero's second friend, a diver, and with her it turns out to be the opposite. At first impression she's a responsive and bright girl, but in reality she's an egoist who rejoices at others' misfortune and looks for opportunities for herself in it.
I don't know how else to praise it without spoilers, but there it is.
Takopi's Original Sin
A very cute and kind picture about cute and kind children, about pure friendship, love, and mutual help. AAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA.