我々はりんごで自分たちの記憶を取り戻すことができます

Chamaru Vieira is a quiet high school student diagnosed with depression. In one accident, he lost his emotions, his parents, and his memory. Since that day, the world in Chamaru's eyes has turned into a gray landscape that has lost its color.
That's his birthday. That day, I met Yoru Ringomori, a high school student who also suffers from loneliness. Although she is a modest and quiet girl, Yoru approaches Chamaru of her own free will for some reason.
In order to find out what the world really looks like, the two have no choice but to interact with the outside world. As we spend more time together, Chamaru thinks. Are we similar, or are we just two unique beings in this world?――
In order to find the answer, Chamaru begins to walk through the gray world, relying on his five broken senses and the apple that Yoru loves so much.