Ikoku Shoujo to Sumire no Hanataba

When they find him, it turns out it was Masaki's Hiijii who had arrived a few months prior, and started cutting up prostitutes. The manga takes a dramatic turn for the dark, when Ryou is implicated for the crime, due to impersonating his great-grandfather, and tries to prove his innocence by proving he is from the future. most think he is crazy but British Intelligence picks him up and locks him away to extract information of relevance to the crown. With his advice, Britain stops the hemorrhaging of it's overseas colonies, and maintains colonial rule in India, South Afrika, and Indonesia. The era of the second British Empire begins. Worsening relations within europe force England to Join the Axis alongside Germany, Japan, and Italy. America remains utterly neutral and begins to languish as an economic and military power. America eventually seeks readmittance into the commonwealth, in exchange for the forgiveness of their debts. 2000 yeas later, Lelouche Vi Brittania is born.

Rose is his grandmother (this explains why his sister is blonde and looks like a foreigner and looks just like Rose) and he is his own grandfather.

An incest story for the century!