Jyunana-banme no Higgs Ijigen no Wakaki Ou

is a Japanese light novel series written by Ryu Hirosaki, with illustrations by Kihiro Yuzuki. The series began publication on December 10, 2014 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Boys and girls found due to amnesia in the particle physics research facility. The two were named Taro Yukawa and Hanako, and decided to live as siblings.

── Two years have passed since then.

A silver-haired beautiful girl who is also protected by amnesia appears in front of the two who celebrated their 14th birthday. The girl, who calls herself a neutrino, called Taro the Higgs and said, "You are the king of another dimension and my fiancée." Then, Taro and his friends, who visited the research facility to find out the true identity of neutrinos, approach their past.

At that time, an adversary of another dimension attacks Taro and others ──!