Sasami-san@Ganbaranai

Sasami Tsukuyomi is a high school student who is also a hikikomori, refusing to leave her home. She lives with her older brother, Kamiomi, who teaches at the school Sasami is supposed to attend. To help her re-enter society, Sasami uses a "Brother Surveillance Tool," a computer program that allows her to observe the outside world. Through this tool, she watches her brother's interactions with the three peculiar Yagami sisters, who appear to have had their ages reversed and have a unique "interest" in Kamiomi. As Sasami observes, strange occurrences begin to happen, including the appearance of magical powers and everything turning into chocolate. The anime explores whether these events are a result of Sasami's warped perception from her life online or if the universe itself is becoming increasingly bizarre.