Ageha  

Tateha Shinki and his girlfriend Ageha have been dating for a year now. They were finally ready to take their relationship to the next level by having sex, but just as they were about to start, Ageha passed away. According to her older sister, this has been happening in every parallel universe where Shinki and Ageha exist, with them always ending up dead when they try to make love. Despite having the option of breaking up with Ageha and preventing her death, their love for each other is too strong, so Shinki will continue exploring all possible outcomes of their relationship until he finds one that saves Ageha.