When summer break begins, Haruka is only thinking of hanging out with her friends—until one fateful night she learns that she’s the keystone in an interdimensional battle for not only the Earth’s future, but the very survival of all existence across the multiverse.

Ai, a young girl with shut-in tendencies, who tries not to interact with others. She keeps one of her eyes hidden behind her hair. One day, she happens to stop by a deserted arcade, where she meets "Aka." Spinning the gacha at their urging, she acquires a "Wonder Egg," and from that moment, her fate begins to change...

Investigator Pavel Frolov gets into a car accident. After that, his life is torn into two parallel realities — in one of them his son Kirill survived the disaster, in the other his wife Svetlana. Every morning, when Pavel wakes up, he finds himself alternately, in reality with his son, then with his wife. In each of these lives, he tries to find out who or what is behind the accident in order to try to connect the two realities together. And at the same time, to return the respect of his son and the love of his wife, to whom he often preferred work before.