A series of yuri one-shots.

The 1st is about two chilhood friends who like music and who are asked to perform at the graduation cerimony of their school.
The 2nd deals with two members of the archery club: Kyoko and her senpai Touko, who is ashamed of her man-like body.
The 3rd is about a young girls-loving teacher who wants to seduce her female students.

The story of a single girl who lives in Atami, who loves to clean...

From ANN:
Kaname Okiura, a student of Prefectoral Umineko Shougyou High ("Umisho" for short), joined the school's swimming club in order to learn how to swim, but the club is filled with weirdos, let alone teaches him swimming. Then, a sunny, happy-go-lucky girl named Amuro Ninagawa who was transferred from Okinawa joined the club. Her extraordinary underwater speed and unorthodox swimming style (plus her personal habit of nude swimming—a powerful magnet to teenage boys) surprised every club member, especially Okiura, because she reminds him of a mermaid-like creature he saw only once in his early childhood.

From Anime Waves:
Rena Misaki was a normal girl in high school in the small town of Otogi. But lately she is being tormented by Kegari Chota (little hamster like imps that cause greatly increased sexual desire). They had been banished from the village long ago by a priest. But somehow they have returned and have taken an interest in Rena. And if that wasn't enough trouble, they are starting to spread. Rena has to find away to get rid of them and have a normal life, before she ends up sleeping with all the guys around her.

Furuya's obsessed with zombies. He collects any figurines, watches any movie, and plays any game with the living dead, and is even only interested in zombie girls. When his cat dies, Furuya begins trying to raise it from the dead using an ancient book of the occult he bought from a shop. But what will happen when he sees the idol of a nearby all girl's school walking close to where he conducts his experiment, wishing to die and be reborn as a different person?

(Source: MU)

Note:
Volume 4 contains the special "Wagahai mo... Zombie de Aru..."
Volume 6 contains the special "Konna Watashi no... Zombie-kko Seikatsu"
Volume 11 contains the special side story "Shiromabito"

Without a single friend, middle schooler Chigawa Kon lives on a small island and laments that she hasn't "fallen in love" yet, unlike her classmates. She often plays by "the Hole", a cave near the sea where a man-eating monster lives, according to folk tales.

One day, as she meets with another girl who accidentally drops her smartphone in the sea, they fall from a cliff together but miraculously survive. It turns out Furuka is also all alone.

(Source: MU)