The college girl Natsuka thinks of the teacher she likes when having fun with herself ? but one day, she plays a small prank and the teacher falls, and is on the verge of death! In the confusion, an Angel of Death appears to her and offers her a chance to save her teacher. However, there are conditions... like she has to have sex with 4 men in 4 hours! Losing her virginity to save the person she loves... spreading herself open for complete strangers! Even having a threesome with perverted businessmen in back alleys... getting her full breasts fondled...! But during the heights of pleasure, will she remember that fated time limit...?! from Renta!