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.
| Title | Time | |
|---|---|---|
| 1 | First Impressions are Everything | 2014-01-09 |
| 2 | A Loli Sister-in-Law Isn't All That Bad | 2014-01-16 |
| 3 | I Can Feel the RomCom Waves | 2014-01-23 |
| 4 | She's Just a Pervert | 2014-01-30 |
| 5 | This Woman Has Given Birth? | 2014-02-06 |
| 6 | I Know! I'll Fill It with a Sister-in-law | 2014-02-10 |
| 7 | That is That, and This is This | 2014-02-20 |
| 8 | Only a Sister can Heal a Scar Left by a Sister | 2014-02-27 |
| 9 | How Humiliating, I'm So Embarrassed! | 2014-03-06 |
| 10 | Looking Up the Term ''Lovey-Dovey Phase'' | 2014-03-13 |
| 11 | Enjoying the Handkerchief | 2014-03-20 |
| 12 | Do You Get It? I Get It. | 2014-03-27 |
