Takuya Arima lost his mother when he was very young and his archaeologist father in a much more recent cave-in, so he now lives with his stepmother Ayumi, who manages an unpopular construction project near the archaeological site his father had been studying. Strange events, including accidents and unexplained lightning strikes, have been happening, but things get personally weird for Takuya when first a bizarre relic and then a treatise on parallel worlds gets shipped to him, apparently from his deceased father, all at the same time that a new transfer student arrives. Stranger still, he briefly meets a naked, elfin-eared girl at a time and place specified by his father, while one of father’s research associates demands the relic he has at gunpoint and insists that his parents are alive but somewhere else. After more lightning strikes lead to an apparent time-and-space shift, no one else present at the incident seems to remember it the next day. – ANN
Streaming: Crunchyroll and Funimation
Episodes: 26
Source: Manga
Episode Summary: Takuya recently lost his father, though considering the circumstances he’s dealing with it fairly well. His dad was a researcher who died doing what he loved, which is about as much as anyone could ask for. In the meantime, Takuya passes his time being the class goofball and engaging in lewd talk with some of the women whose paths cross his (including his teacher).
Takuya receives a couple of packages that say they’re from his late father – they contain a strange object and a book that speaks of strange things like parallel dimensions. A new transfer student warns Takuya that the construction project headed by his stepmother is treading in dangerous territory, which turns out to be true; in addition to strange earthquakes and lightning strikes, Takuya discovers that it’s also a focal point for his father’s research when his father’s research assistant confronts him there. He also encounters a mysterious elf-eared girl, and his connection with her (as well as the strange bejeweled object left to him by his father) initiates some sort of warp. When Takuya wakes up the next morning, no one seems to remember what occurred the night before; is it memory loss, or something more extreme?