In her report, Sasami explains how she was trained at the Tsukuyomi Shrine to inherit Amaterasu's power, which had been passed down from her family through incestuous means. She soon began to question her life after discovering the internet, eventually deciding to run away with Kamiomi. As she writes her report, Sasami discovers that a third arm has grown out of her chest, soon discovering it has a personality of its own, which tells him Kamiomi plans to return to the shrine in order to protect her from hunters who want Amaterasu's power. Struggling against the sunlight, Sasami comes across Tsurugi, who brings her to Tsukuyomi Shrine and reveals herself to be Amaterasu herself, who gave her power to Sasami's ancestors long ago. As Tama and Kagami arrive to attack the shrine, Tsurugi explains how she created them from parts of herself.
The Japanese call them hikikomori-people who've become so withdrawn socially that they refuse to leave their homes for weeks and even months at a time. For Sasami Tsukuyomi, who's attempting to pass her first year of high school despite being a shut in, it's more than just a word. Fortunately though, she lives with her older brother Kamiomi, who just happens to be a teacher at the school Sasami is supposed to attend. Not to mention, her "Brother Surveillance Tool" which lets her view the outside world via her computer and will, theoretically, allow her to readjust to interfacing with people again. What it mainly does, however, is let her view her brother's interactions with the three very odd Yagami sisters, who inexplicably seem to have had their ages reversed and have various types of "interest" in Kamiomi. And then things start to get really weird... Magical powers? Everything turning into chocolate? Is life via the web warping Sasami's brain, or is it the universe that's going ...
