Started Dirge

John Swift is a Japanese-English half who lives in London. He encounters Ares boy in the neighborhood and they gradually become close friends. One day Ares family gets shot down by bandits while Ares getting kidnapped and probably also killed afterwards. Many years ago boys reunite, but they are not the same anymore...
This episode starts as John receives a warning from Ares. A few days later a woman Jessica appeared before his eyes.

[From vndbreview]