Sion no Niwa

Sion no Niwa takes place in the Sion Botanical Research Institute, which is visited by those afflicted with mysterious diseases. The main story is divided into four parts. "Spring: Symbiosis" follows a girl with mysterious regenerative properties and her older brother. "Summer: Midsummer Ocean Night" follows a young boy; within his body grow plants. At night, he is charmed by a mysterious beauty, but he cannot meet her. "Autumn: One Night, One Thousand Years" follows a woman who loses her memory every 15 hours. Meanwhile, the mysterious fungi that grows in her body begins to subsume her. "Winter: Renatus" follows a man who recently received a heart transplant and now lives in loneliness. Inside a dream that takes place in a strange bamboo grove, he witnesses a girl who who flees from him.

(Source: Comic Natalie, translated)