Twilight is an agent that works for WISE, Westalis's intelligence agency, and he is tasked with investigating Desmond, who is in Ostania and planning to start a war. Twilight disguises himself as the psychiatrist Loid Forger and adopts a girl named Anya so that he can enroll her into the prestigious Eden College to get closer to his target. Unbeknownst to him, Anya is actually a telepath who can read people's minds. One day, members of a mafia group that is after Twilight kidnaps Anya. Loid realizes that he needs to reconsider his priorities and...

Yor moves in with Loid and Anya. Now that they are a family, they need to prepare for the interview. But Loid realizes with how Anya and Yor currently are, the interview probably won't go well. In order to make sure they all understand how an upper-class family should be, Loid decides that they should all go out as a family. They go to the theatre and a museum, but it's just not clicking with Anya and Yor. Twilight begins to lose hope, but...

Next week is Eden College's midterms. That week happens to include the new moon, the one day of the month Anya can't use her powers to cheat. But then, Yor suggests that Yuri should be her tutor...

The midterms are over. Loid is nervous about Anya's test scores and heads to Eden College to alter the answers. However, there already seems to be another guy there with the same motive that's making himself insanely suspicious and obvious?!

Damian does well on his midterms, so he earns a Stella. Everyone around him is now praising him, but for some reason, his classmate George seems to be looking at him begrudgingly. The reason being...

After seeing Anya off to school, Yor finds Anya's gym clothes on top of her desk. At this rate, Anya will surely have trouble in her gym class. Yor runs to deliver the forgotten clothes!

Anya has to write a report about an occupation she's interested in, so she ends up going to Loid's place of work, Berlint General Hospital. As soon as Loid was out of sight, Anya starts to explore!

Anya becomes very interested in deciphering codes after seeing it done in her spy cartoon, so she makes her own code and sends Loid and the others secret messages. Will they be able to crack the codes?!

Fiona, who works at Loid's hospital, happens to actually be the female WISE agent Nightfall. She is irritated that Operation Strix is facing delays, so she suggests that she becomes Mrs. Forger instead. She also decides to show up at the Forger household unannounced and comes face to face with Yor!

Anya loves the penguin plushie that Loid got for her, and even sleeps with it. However, a pale shadow shoots jealous glares in the penguin's general direction...

The secret files called the Zacharis Dossier may cause a war between the East and the West. In order to obtain a painting that is supposed to be the hiding spot for these files, Loid and Fiona enter an underground tennis tournament run by the owner of the painting, Campbell. If they win, the art piece they're after will be presented. Loid and Fiona enter as a married couple and play various skilled players including pro players!

The underground tennis tournament is finally heading to the final match. The Campbell siblings that Loid and Fiona are up against are playing dirty, as they have altered tennis rackets as well as the staff helping them out. But the spy pair from WISE overcome one obstacle after another and Loid deals the final blow! But right after the match, the State Security Service finds out about the dossier and infiltrates the tournament...

Yor becomes anxious about their pretend marriage after Fiona shows up. Loid notices this and thinks that Yor had started to develop romantic feelings towards him. For the sake of the mission, he flips on his Twilight mode.

Becky takes Anya to the department store so they can buy Anya some cute clothes. She uses her rich girl powers and rents out a whole shop where they start their own little fashion show.

A social gathering happens at Eden College once every half term. It is a strictly guarded event where only Imperial Scholars and their parents, the VIPs of Ostania, are allowed to go. Damian tells his brother that he'd like to see their father when he attends the event. Loid finds out about that and uses Damian to get close to his target.