Fate/Zero 2nd Season

Synopsis

The theater is demolished after Saber destroys the Grail, but Kiritsugu is shocked to see the Grail's black ooze pour down from the sky and flood the city, destroying everything it touches and engulfing Archer. Kariya is seen leaving his basement to finally reunite Sakura with Rin, but in reality, he collapses down the stairs and is consumed by the crest worms below, leading Sakura to accept her fate. Kirei awakens to see that the Grail has resurrected him and granted Archer a mortal body. Seeing that his wish of destruction and tragedy has come true, Kirei laughs hysterically at his own lack of humanity, but he seeks to fully understand his desire, and Archer agrees to follow him. In the aftermath of the destruction of the Grail, Kirei briefly notices Kiritsugu desperately searching for survivors in the burning rubble, and becoming overjoyed to find a young boy named Shirou still alive.
The next day, Waver asks Glen and Martha to let him stay with them a while longer as he earns money to travel around the world and find his own path. After presiding over Tokiomi's funeral, Kirei meets Rin and her mother Aoi, who has survived but suffered severe brain damage and does not comprehend that her husband is dead and Sakura is gone. Kirei gives Rin the Azoth dagger and relishes in her grief. Saber, having become a Heroic Spirit again, relives her final moments on the battlefield during her life and remembers Lancelot's final words to her as he expressed his regret over having betrayed her and falling in love with Guinevere. Saber grieves that she does not understand anyone and weeps for having seemingly failed as a king, promising to win the Holy Grail in the next war for their sake. A voiceover by Kiritsugu reveals that he attempted to return to the Einzberns many times, but Jubstacheit von Einzbern, the head of the family, refused to open the forest's barrier since Kiritsugu did not return with the Grail, and thus he never saw Illya again. Instead, he decides to live in Fuyuki City and adopt Shirou. Five years later, Kiritsugu tells Shirou one summer night how he once wished to be a hero. Shirou promises his father that he will fulfill that dream for him, and Kiritsugu, due to the Grail's influence, quietly passes away, reminiscing about the time when Shirley asked him what he wanted to grow up to be and concluding that he still wants to be a hero.

(Source: Wikipedia)