According to an ancient legend, mermaid's flesh can grant immortality if eaten. 500 years ago, Yuta unknowingly ate a piece of mermaid's flesh. For centuries, he travels across Japan, hoping to find a mermaid, thinking she may be able to make him a normal human again. When he finally finds one, he discovers that she and her companions have been raising a girl to be their food so they can eat her and take on her youthful looks. That is how mermaids stay young. Yuta kills the mermaids and rescues her, but she has already eaten some of the mermaid's flesh. Although he had to kill the mermaids, Yuta isn't too disappointed. Yuta's once lonely existence is now over, as he has found a companion in Mana. And Mana, who had been trapped in a small hut her whole life, finds delight in even the simplest of things. Together, Yuta and Mana attempt to seek out more mermaids, trying to become normal humans again.

Tennomifune Academy is an elite institution for the best and the brightest, with the exception of Class 1-7, the so-called "Happiness Class." Each member of the classroom copes with personal misfortunes, and the special class is geared to help them move past their issues and find true happiness. After being accepted into the academy, An Hanakoizumi, Ruri Hibarigaoka, and Botan Kumegawa find themselves placed into the Happiness Class, plagued by dreadful luck, love problems, and bad health respectively. Alongside their classmates, they do their best to overcome the difficulties they are faced with in pursuit of a life filled with joy. [Written by MAL Rewrite]

Wangyou, Master of Hanshui Temple died mysteriously and when the news about a golden coffin spreads throughout the world, it triggered disputes between the World of Martial arts. Join a group of youths, Lei Wujie, Xiao Se, Tang Lian, Sikong Qianluo, Heavenly Maiden Rui in their adventure as the mystery of the golden coffin unravels.

Transfer student, Aoba Shunsuke, arrived at Sunshine School only to find the premises empty. He was secretly gleeful to be the first to reach the school, oblivious to the fact that it was Foundation Day and a rest day for the institution. At that moment, a big-sized "L"(Eru) beauty by the name of Natsumi appeared before him and the two of them hit off together even though Shunsuke was so much smaller than her. Shunsuke's mother runs a women's apparel busines but the shop is in need of manpower. Shunsuke offers to help out at the shop but fumbles a lot because he does not know how to interact with the ladies. Eru decides to step in and help out around the shop and this pleases Shunsuke's mother. This is a romance story that shares the joys and woes of the "SL" combi between Shunsuke and Eru.