Ai Hashimoto

While struggling to make friends after his parents’ divorce, Koyomi Takasaki meets Kazune Takigawa, but apparently, they already have. Kazune reveals that she’s from World Line 85, an alternate universe in which she and Koyomi are lovers. But in a reality where moving between dimensions is natural, could Koyomi be the one from another world?

Four strangers' lives intersect over three decades as they confront grief and hope after the 1995 Kobe and 2011 Tohoku quakes and the COVID-19 pandemic.

Koyomi Hidaka is a boy in elementary school who lives with his father after his parents' divorce. One day, he meets a girl named Shiori Sato at his father's workplace. The two of them begin to fall in love, but then they learn that their parents are going to marry each other, so they decide to run away to a parallel world in which they aren't destined to become brother and sister.

Tiny creatures called "Parasites" have arrived on Earth with the sole purpose of taking over human bodies and preying on mankind. One such Parasite latches on to ordinary high school student, Shinichi Izumi. Fortunately, he is able to fight it off before it reaches his brain. But unfortunately, it is now stuck within his right hand. Shinichi cannot reveal his terrible secret to those around him, but a strange relationship develops between himself and the creature he calls "Migi" (Righty). Before long, they begin to encounter other Parasites which launch savage attacks against them and endanger the life of his childhood friend, Satomi.