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The protagonist, Kōichi Yukino, used to live on the island of Harukajima, but moved to Tokyo as a child. Kouichi comes back from Tokyo to this very ordinary and small island off the coast from mainland Japan and lives with his grandfather. When he returns, a part of his childhood memory on the island is missing. Kouichi is not a normal human; he is a type of blood-sucking vampire, though he cannot attack people.
After a series of unfortunate events, the young Hirose Takuma was rendered blind. In an attempt to reverse his condition Hirose moves in with his uncle in a rural village, and upon his arrival he quickly begins to make new friends. However, Hirose soon discovers that one of his classmates, Hayami Kohinata, is being harshly bullied by her peers for reasons that neither she nor anyone else wants to explain. Even the seemingly honest and gentle Hinata Kagura, who had been doing her best to be friendly and helpful to Hirose since his arrival, acts harshly towards Hayami. Once a mysterious girl bequeaths Hirose with a life-changing gift, he takes it upon himself to help save Kohinata from her loneliness while working to uncover the truth of the situation.
Indigo island is a place like no other, to deter emigration and attract tourism they have become the 'sex' destination as residents are punished if they are not have having frequent sex! On this crazy island, Hitori Misaki is still at school and one of the rare virgins trying to keep her secret and find love in such a lewd environment!
Tetsuya Mizuno, a third year high school student, meets Yuzuko Sanada, a childhood friend whom he nicknamed Yuzu one day on his way to school. Yuzuko actually has a crush on Tetsuya. To her advantage, she is skilled at cooking and homemaking, but has a timid personality. He later also meets Rui Nakane at the pool after running errands for Asumi Akiyam, his cousin who is also the school nurse. Rui holds vast knowledge, and is very affectionate towards animals to the extent where her aim is to become a veterinarian. Despite her love toward animals, she has a severe fear of touching cats due to a past incident...