※This article, for description purpose of the Spy x Family latter cour expected to air in October, includes slight plot disclosure of the Spy x Family first cour. If you are interested, this is one of the best anime released in 2022, so check out from the first episode now!

There once were two nations called OSTANIA in the East and WESTALIS in the West.
The two countries are currently pausing their conflicts and temporarily maintaining diplomatic relations.
However, an unknown organization is attempting to bring an end to the pause and to restart the war.

WESTALIS spy, Loid Forger sneaks into OSTANIA.
Though he tries to approach his target...... the only opportunity is when an elementary school, that the target’s child attends, has an event. In order to come close to his target, Loid ends up creating a fake family......? !

Talented spy agent from the western nation, WESTALIS.
Nicknamed 『Twilight』, Loid Forger is not his actual name.
As a war-orphan himself, he works to create a world without war.
He possesses an extraordinary intelligence as well as athletic ability and is a spy that makes the impossible possible. Personality-wise, he is mostly dry but is a sucker for (kind to) children. The more he spends time with the two as family, he feels guilt toward involving them into this fake-family plan.
He is not aware of the other two’s true identities.

An assassin for OSTANIA, the eastern nation. Her nickname is 『Thorn Princess』.
She has been secretly eliminating villains that try to restart the war. She meets Loid when she was also considering a fake marriage to mask her assassin identity. Her personality is kind and gentle, but she has low tolerance for alcohol. She has beyond-human physical fighting abilities, exceeding Loid’s even. She works hard every day as the mother of the pretended family but is not very good with housekeeping tasks.
She does not know the true identities of the other two.

A girl with psychic abilities who used to be a subject of war-weapon experiment. She escaped the research institute and hid herself in the orphanage. She has a telepathic ability; she successfully became Loid’s adopted-child through seeing his thought-process that sought for a smart child to sneak into the elementary school. She knows that the two are a spy and an assassin that act for the sake of peace, and secretly helps to keep the family stay together.
Knows about other two’s real identities.