OK i got a review that said they were confused on why Rini called Seiya dad, well the story behind that is Usagi and Seiya had an affair in the same time frame thatMamoru and Usagi made love for the first time, now in the Moon Kingdom if your engaged to anyone you guys are pretty much married and everyone knows that it's looked down upon when a Royalty cheats on they're spouse so when Usagi was pregnant with Rini she told everyone including Seiya that the baby was Darien's, however, Seiya had a DNA test run on the baby to figure out it was his.