Naraku No HanazonoNaraku no Hanazono; 奈落の花園; In the Gardens of Gehenna; Dûzah Bahçesi

Mary, a girl who moved from Tokyo to the countryside, meets the mysterious girl Colin in a "secret garden" up in the mountains. With nowhere to go, they share a "secret" in the garden that they can't tell anyone. They didn't realize the consequences of what they did....... (Source: Yuri-Hime, translated)