Type-Moon, isn't this really the other world?

When he woke up, Lin Jiuan found himself traveling through time and space and becoming the sixth Type-Moon beast.
In order to avoid the fate of carelessly eating his own mother, Lin Jiuan severed his connection with the underground Holy Grail and fled to Fuyuki overnight.
Although he had no mana supply, it didn't matter. As the sixth beast, Lin Jiuan had transferred his power to the system. As long as he could corrupt the heroic spirits, he would receive system rewards. From the moment he was adopted by the Tosaka family, it was his time to show his skills...
Rin? Sakura? Why are you two little brats looking at me with such strange eyes?
Orange, Altria, how come you guys with thick eyebrows and big eyes are so perverted?
No, Irisviel, Brunhilde, be more reserved. You have families, don't you?!
What the hell is this about taking away my custody?
Meili: "Hehe, little guy, you don't want Ai Ge to know that you are surrounded by women here, right?"
Lin Jiuan: “???”
"You bad women, stay away from me!!!"