A girl that goes by the name "Astra" is getting sick and tired of her nonchalant boyfriend named Michaelis until she discovers something unusual lingering in his closet on Valentine's Day. She experiences adventures beyond any of her most craziest dreams and gets the chance to live various lives in many different worlds. Soon after the adventures take a turn for the worst she realizes that her boyfriend's alternative versions are in danger. This whole fantasy-like dream quickly becomes an unescapable nightmare.