Sasami believes to have seen her mother, Juju, walking through the streets, despite knowing it shouldn't be possible. The next day, Sasami encounters her again and decides to drag her along to go shopping with her. Despite having fun, Sasami inevitably brings up the matter of how Juju could possibly be here as she had already passed away due to an illness. Juju reveals that she negotiated with the king of the underworld following her death to allow her to stay in the mortal world until her corpse rots as she disappointed to hear about Sasami leaving the shrine. Juju attempts to force Sasami back to the shrine to resume her training, believing Sasami to have wasted her life. Tsurugi and the Yagami sisters arrive to fight against Juju, but struggle against the powers the king of the underworld have granted her. Kagami is stabbed whilst Tsurugi is pushed through a gateway to the underworld. Not wanting Tama to get hurt as well, Sasami agrees to go with Juju back to the shrine.
The Japanese call them hikikomori-people who've become so withdrawn socially that they refuse to leave their homes for weeks and even months at a time.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 ...
