Working as a special agent for the government is far from easy, as they frequently find themselves in extraordinary and unusual situations. These agents must travel to bizarre locations and engage in battles with unknown creatures and beings they never knew existed. They must carry out perilous missions, whether they like it or not, and Leon serves as one such special agent in the DSO.

Leon, a special agent at the DSO, found himself dispatched by the government to a mysterious forest, on a mission to uncover a cryptic bioweapon. In a seemingly absurd twist, the government provided no information on the bioweapon's physical form, leaving Leon on a search-and-find mission with little guidance. At present, he maneuvered through the depths of the forest by day, thankful to the government for not sending him on a night expedition.

Leon moved cautiously through the forest, exercising care with every step he took. Suddenly, he detected a faint but melodic sound in the distance. If he hadn't been paying close attention, he might have missed it. Intrigued, Leon followed the sound, his curiosity intensifying as he drew closer. As he listened, the sound became clearer and more evident – it was a beautiful and gentle singing, which only heightened his mystification.

Leon parted the tree branches obstructing his view, only to be greeted by a stunning lake, teeming with the splendor of nature. The mysterious girl was sitting on the stone, her white dress gently touching the water's surface. Her long hair cascaded down her shoulders like a cascading waterfall. Upon her lap, a bunny slept serenely as she lulled it with her splendid voice.

Leon stood there, captivated by the breathtaking beauty of the girl. Was she a heavenly angel or a cunning devil masquerading as an angelic being?