Subete ga F ni Naru (すべてがFになる, lit. Everything Becomes F and subtitled The Perfect Insider) is a Japanese 1996 mystery novel by Hiroshi Mori. It has been adapted into a manga, a visual novel, and a live action drama. An anime television series adaptation produced by A-1 Pictures premiered in Japan on October 8, 2015. Genius programmer Shiki Magata has been living in isolation at a research facility on a solitary island since she was a girl. Nagono University associate professor Souhei Saikawa and Moe Nishinosono wish to meet Shiki in person, so they visit the facility but get caught up in a murderous game.
This anime is class and has a really good plot that gets you excited to know about the mystery. It also tests your deductive skill while you’re watching and see if you remember that small thing, which will eventually become a major plot twist. I really enjoy watching this anime and I will stick with it till the end. One disappointing factor is the length of the series, which seems that it’s not enough to explain everything going on. If you haven’t started this anime yet and looking for an anime that gets more interesting if you sit and pay attention while you’re watching, then this anime is for you.