After a massive 8.0 earthquake in Tokyo, siblings Mirai and Y?

Re:Zero kara Hajimeru Isekai Seikatsu Suddenly, high school student Subaru Natsuki has been summoned to another world on the way back from the convenience store. With the biggest crisis of his life being summoned to another world, and with no sign of the one who summoned him, things become even worse when he is attacked.

Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.

Ten years ago, an inscrutable and abnormal territory known as Hell's Gate appeared in Tokyo, altering the sky and wreaking havoc on the landscape. The heavenly bodies disappeared, replaced by false stars.

The prequel to Fate/stay night. The fourth holy Grail War based on Type-Moon's Visual novel where Magus and their summoned servants fight for he holy grail which will grant them one wish.

The battle for the Holy Grail continues, with more lives lost and more secrets revealed. When the curtain falls, who will emerge victorious is anyone's guess.