Zero no Mono  

Wenn der Mond verschwindet, 제로의 자, ゼロの者

The encounter between strangers passing by on hot summer nights leads to sexual exploration among them. A young man is drawn to an innocent schoolgirl he sees outside his home due to his intense sexual desires. Unable to resist, he spills some of his private fluids onto her as a sign of his attraction. To his surprise, she responds positively and the two embark on their own forbidden relationship for several days.