"Dead people are buried under the cherry tree." Which cartoon did this sentence come from?

The most famous (and it seems to be the earliest) source of this sentence is the old works of the aunts-"Babylon in Tokyo" and "X-War", in which the mother was killed by her father and buried under a cherry tree to complete a ceremony, and then Xing met the imperial teacher of Yin and Yang, and they had a very basic relationship. Xing couldn't bear to kill it to complete the ceremony, so he killed it. In a rage, Liu Zan of unknown so cut off contact with him, and the two turned against each other (this is the story of Babylon in Tokyo, and the X War is a continuation of their hatred. They joined the opposing side, and then in a duel, Shi Lang voluntarily died at the hands of Liu Zan. )