Regarding Why My Imouto Is Acting Strange Lately (Hololive)

A former NEET that had reincarnated as former oshi Shirakami Fubuki's big brother, Haruto was initially confident that life could only go better from now on. Yet in the process of bringing up Fubuki alone in the absence of their parents, something seems to have gone terribly wrong. "Onii-chan, you will never leave me...