(I really couldn't find another synopsis. Everyone's using this one. I don't even know how old this synopsis is, it's not on Wikipedia anymore. Great!)

Two women in a relationship with the same man accidentally cross paths in his apartment after his death. In a strange turn of events, they begin living together, and develop a relationship of their own.

While reading alone, Shijima is approached by her classmate, Majime Yamashita, an eccentric girl with a fried egg on her head. Majime pesters Shijima to be her friend, giving her the nickname "Shimeji" upon seeing the mushrooms growing on her head. After enough insistence on friendship, Shimeji gives in and decides to keep Majime company. Shimeji tries to get through a less-than-normal high school life as she explores the mysteries and wonders of this strange world with her new tenacious companion.

On a dark and snowy night, Sho-an drags home what he believes to be the corpse of a beautiful man. But, even though Sho-an is ready to reduce the body into medical supplies, he is dismayed to discover the body lives. Sho-an names his corpse-cum-patient Yuki and gains a houseguest that eats his food and keeps his bed warm throughout the year.

As expected of a competitive tournament, the four squids representing Team Blue come across many skilled adversaries on the other teams, such as their first opponent, the S+ ranked Roller user Rider. Despite this, Team Blue strives to work against the odds and make their mark on their tournaments—and perhaps on their rivals as well.

After her life takes a turn for worse shortly after dropping out of college, Kabi Nagata becomes depressed and develops an eating disorder. She feels immense pressure from her family to be a "normal" and productive person, along with an acute desire to belong to a community. Despite attempts to solve these problems, she struggles to resolve her pain, and her situation worsens.

Sun Jing has a massive crush on a girl she sees at the bus station—feminine, blonde, and absolutely adorable, Qiu Tong is everything Sun Jing desires. But the tomboyish, outgoing Sun Jing cannot bring herself to utter a single word in Qiu Tong's presence. Once she musters up the courage, however, Sun Jing successfully introduces herself and secures a friendship with the cute girl. Although they are only friends for now, Sun Jing will do anything to see Qiu Tong smile; and with her genuine kindness, she might just win Qiu Tong's heart.

Now, it appears that Kei is in love with Sagawa-senpai. In order to bring said happiness to Kei, Aachan uses whatever techniques there is to bring those two together, completely disregarding his own feelings. But, what about his own happiness?