Watch Engaged to the Unidentified

Looking to make up for missing White Day, Hakuya is torn on what gift he should get for kobeni.

Benio seems to grow colder towards Hakuya, who seems a bit downhearted when Kobeni denies confessing. Meanwhile, Kobeni clears up the misunderstandings surrounding the engagement with Konoha, who attempts to stave off Niko's interest in Kobeni by giving her a plain article to write about. Later, Mashiro explains to Kobeni that Konoha's interest in marrying Hakuya was only because they are the same species, revealing that Kobeni is also similar to them due to having half of Hakuya's power. The next day, Kobeni decides to buy her and Hakuya matching handkerchieves, also buying some for Benio and Mashiro.

As Mashiro informs Konoha about Kobeni and Hakuya's engagement, Hakuya chases after Kobeni, assuring her that he is already engaged to her. When Niko overhears this and asks if they are dating, Hakuya denies it as he wanted to respect Kobeni's wishes about keeping the engagement a secret. Hearing about this from Niko, Konoha believes she is still in with a chance. As Kobeni asks Konoha to keep her engagement a secret, Konoha suggests that if she is against it, she should just break it off. Kobeni cries upon hearing this, and the conversation is soon interrupted by Benio. Later that night, Kobeni assures Hakuya that she isn't against their engagement, which Mashiro interprets as a love confession, encouraging Hakuya to get Kobeni something spectacular for White Day.

As Kobeni decides to keep Konoha's true identity a secret from Benio, Niko continues to investigate her, despite warnings from Hakuya. Later, Mashiro and Konoha find some time alone to confirm they are from the same species, with Konoha assuming they were trying to get close to Benio. After Mashiro and Hakuya confirm this isn't the case, Konoha tells Hakuya that, as a male of the same species, he should marry her, which Kobeni overhears.

Student Council secretary Konoha Suetsugi feels some hostility towards Kobeni and Mashiro because of their closeness to Benio. Newspaper Club member Niko ÅŒno offers to help get some dirt on them, though her overenthusiasm proves too much for Konoha to keep under control. Konoha becomes more paranoid as Kobeni keeps walking in on her private outbursts. After having a brief argument with her over Benio, Mashiro suspects that Konoha is part of the same species as they are, with Konoha coming to realise the same thing.

Benio reveals information about Kobeni's past. The sudden revelation causes a short in Kobeni's mind and the shock leaves her bedridden. Benio takes over in the kitchen, and after a progression of nightmarish meals, Mashiro comes to appreciate what she's lost in Kobeni.

In gym class, Kobeni struggles with the vault. Her classmate Mayura claims "she does have a handicap, after all." Eventually Sunday rolls around, and while Kobeni busies herself with housework, Benio offers to help.

Mashiro becomes terrified of the thought of alien abductions. Benio continues to torment Mashiro with her love.

The sudden arrival of a fiancee and a sister-in-law has Kobeni at a loss, with. Her fiancee Hakuya is one thing, but despite her sister-in-law Mashiro definitely being a little girl, she somehow ends up in the same class at school.