S01E01 First Impressions are Everything
Kobeni Yonomori, who has just turned sixteen, is shocked to learn she has a fiancée named Hakuya Mitsumine who, along with his little sister Mashiro, come to live with her and her older sister Benio....
Engaged to the Unidentified
S01E06: I Know! I'll Fill It with a Sister-in-law
Kobeni's mother, Akane, who had always known the Mitsumines weren't human, tells Kobeni that she is no less thankful to them for saving her life. The next morning, Kobeni tries to learn more from Hakuya and Mashiro about their other forms, though Hakuya refuses to transform in front of her. As Kobeni turns her attention towards Valentine's Day, she ponders whether she should marry Hakuya or not. On Valentine's Day, Kobeni tries to work up the courage to give Hakuya some chocolate, but has trouble finding the chance. She finally gets the opportunity after her friend, Mayura Momouchi, comes over.
Overview
Just an ordinary teenager, Kobeni Yonomori receives quite the surprise on her 16th birthday—a fiancé and a sister-in-law she never even knew she had. As a result of an arrangement that her late grandfather made, Hakuya Mitsumine and his younger sister Mashiro have moved from their countryside home to the Yonomori household in order to deepen their relationship with their new family members.
This story follows Kobeni's "love life" with Hakuya as she tries her best to adjust to the abrupt changes forced upon her. However, as some extraordinary secrets regarding the siblings come to light, Kobeni will find her life changed forever.
Episodes
S01E02 A Loli Sister-in-Law Isn't All That Bad
As Mashiro tries to come to grips with Benio's popularity at school, Kobeni continues to try and remember about Hakuya. Later, Mashiro gets spooked at the thought of aliens existing. Meanwhile at school, Mashiro accidentally...
S01E03 I Can Feel the RomCom Waves
Whilst Benio finally gets Mashiro to come to the student council room for tea, Kobeni goes with Hakuya to buy some ingredients for scones. Curious as to why Hakuya is so thoughtful of her, Kobeni...
S01E04 She's Just a Pervert
The morning after learning about Hakuya, Kobeni ends up with a fever due to her weak body. As Benio informs Mashiro and Hakuya about what she told Kobeni, she blames herself for Kobeni's accident back...
S01E05 This Woman Has Given Birth?
Kobeni learns about a member of the Mitsumine family coming over, along with the fact that Mashiro is nine years old. Whilst shopping for supplies for her guest, Kobeni comes across a young woman who...
S01E06 I Know! I'll Fill It with a Sister-in-law
Kobeni's mother, Akane, who had always known the Mitsumines weren't human, tells Kobeni that she is no less thankful to them for saving her life. The next morning, Kobeni tries to learn more from Hakuya...
S01E07 That is That, and This is This
Student Council secretary Konoha Suetsugi feels some hostility towards Kobeni and Mashiro because of their closeness to Benio. Newspaper Club member Niko Ōno offers to help get some dirt on them, though her overenthusiasm proves...
S01E08 Only a Sister can Heal a Scar Left by a Sister
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...
S01E09 How Humiliating, I'm So Embarrassed!
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...
S01E10 Looking Up the Term ''Lovey-Dovey Phase''
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...
S01E11 Enjoying the Handkerchief
Hakuya is troubled over what gift he should get for Kobeni to make up for White Day. Meanwhile, Mashiro is almost spotted using her powers by Niko, who becomes determined to investigate the existence of...
S01E12 Do You Get It? I Get It.
As Kobeni worries about Hakuya and Mashiro, the only clue she has being a text saying they had gone back to the mountains, Mayura encourages her to go to the mountains herself to learn the...
Cast
Aimi
Mayura Momouchi (voice)
Asuka Kakumoto
Niko Oono (voice)
Yui Watanabe
Akane Yonomori (voice)
Yuri Komagata
Shirayuki Mitsumine (voice)
Saki Fujita
Konoha Suetsugi (voice)
Wataru Hatano
Hakuya Mitsumine (voice)
Haruka Terui
Kobeni Yonomori (voice)
Ayane Sakura
Nadeshiko Kashima (voice)
Eriko Matsui
Benio Yonomori (voice)
Yu-ri Yoshida
Mashiro Mitsumine (voice)
