Sasami-san at Ganbaranai

People who have become so socially reclusive that they won't leave their houses for weeks or even months at a time are known as hikikomori in Japan. It's more than just a term for Sasami Tsukuyomi, a shut-in who is struggling to pass her first year of high school. Fortunately, she shares a home with her older brother Kamiomi, a teacher at the institution Sasami is meant to attend. Not to mention her "Brother Surveillance Tool," which purportedly enables her to retrain herself to interact with people by allowing her to watch the outside world through her computer. However, it mostly allows her to see how her brother interacts with the three extremely strange Yagami sisters, who for some reason appear to have their ages reversed and have various kinds of "interest" in Kamiomi. Then, things start to become quite bizarre... magical abilities? turning into chocolate everything? Sasami's brain is being altered by life on the internet, or is the entire universe going insane?