In a certain deep forest, there is a lonely walking girl. Her name is Alps. And this is a dangerous forest where many terrible things happen. But Alps, while frightened, continues on. To save her sick sister, she keeps walking, trying to leave the forest with ○ grass in hand. "Wait for me, big sister." However, this forest is not so easy that it can be overcome with just determination. Eventually, she encounters suspicious men... The fate of the lonely, lovely girl, Alps, is...

Alps wanders through the dangerous forest to save her sister. Something unidentified chases after her, screaming strangely! Yes, this is... tag in a dangerous forest.