If you're looking for manga similar to Mizu Wakusei Nendaiki, you might like these titles.
In a futuristic Japan, the waters have risen and the population has declined; everything is slowly winding down. In this quiet and reflective time, Alpha, a robot, cares for her owner's cafe in his absence. As Alpha lives her serene and peaceful life, interacting with humans and robots alike, the gentle twilight years of humanity are unveiled.
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all about life and enjoying the small things it has to offer.
Similar artstyle, very laid back and an atmosphere that draws you in unlike anything else
Ogawa Tomoo, a high-school boy, who can't figure out why his classmate, Oomori Yuka, likes him so much. Unlike him, she's friendly, upbeat, excels at sports and is one of the most popular students in the school. Tomoo doesn't understand why someone so attractive would be interested in someone like himself. He decides to push Yuka away for her own good but her persistence eventually pays off and he can not help but be attracted to her.
NAGAI Junpei, a high school freshman, wakes up one day to find all of humanity in a deep sleep. In a free world, overflowing with desires, his strange survival days begin.
If he sees underwear, humanity will be destroyed!? An original anime series from the noitaminA block, PUNCH LINE centers on Yuta Iridatsu, a high school student, with a peculiar habit. When he sees a girl's panties, he gets so excited he faints! After a certain incident with a ghost cat, his soul gets separated from his body. Using his special powers, Yuta watches the daily lives of the inhabitants of an apartment and sometimes plays tricks on them. Eventually, Yuta decides to unlock the secrets to why Earth will be destroyed and tries to save it!
In the year 20XX, heroes exist, by and large thanks to the wonders of science. In the town of Matsugaoka are the Matsugaoka Angels, a trio of beautiful angels, veritable "wild cats" who will savagely punch, kick, and shoot their enemy.