Aru Hi, Bakudan ga Ochitekite

is a Japanese light novel series written by Hideyuki Furuhashi, with illustrations by Yukari Higa. The series began publication on October 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Isn't it a human being, a" bomb "?" "Yes, that's right. It's the latest model ~". One day, a 50-gigaton "bomb" that fell from the sky resembled a girl who sneezes for some reason, and a timer was making a clicking noise in her chest- "a new type of bomb dropped in the city center." Including the title work that depicts "Dating with", "A strange disease that regresses memory every time you sneeze", "Dead girlfriend who asks every night", "Small god living in the library", "Classmate without body", etc. Seven boys, meets and girls who are warm, funny and a little sneezing, presented by the genius Hideyuki Furuhashi.