As the only daughter of a famous adventurer, Hinata Ema has had a pretty lonely life. But when her father remarries, she leaves the newlyweds alone and moves in to a huge building with her 13 cute new stepbrothers—each of which has a very unique personality. Oh, and her over-protective, talking pet squirrel is there, too. Is love in the air for Hinata?
Ema's father remarries and she suddenly finds herself with thirteen new brothers. Today, she's moving in with them and meeting them all for the first time, so she's in for quite a day.
After spending a lot of time alone with her father away overseas for work all the time, Ema is enjoying being part of a big family. But she also has some interesting run-ins with Futo, the family's pop star with an attitude.
Ema finds out what Futo wants from her. And with her father's wedding coming up, she finally meets the last of the thirteen brothers.
Now a couple months into her new living arrangement, Ema's relationships with some of her brothers are growing and changing. As she roots for Tsubaki to get his dream voice acting gig, she also bonds with Natsume over video games.
A lack of dinner ingredients leads to a picnic under the cherry blossoms. And Ema finally has a chance to see Subaru play basketball.
Ema and Yusuke are in for a surprise at school, courtesy of Futo. And the snapshots Ema has been taking garner some attention since none of the brothers ever think to take photos.
Ema, Yusuke, and Futo have their school's Culture Fest coming up, where Futo gets up to his usual mischief. And at home, Azusa seems to be starting to crack under the pressure of the role he won away from Tsubaki.
With Azusa falling ill, Tsubaki struggles with how their fight resulted in Azusa's collapse. And in the meantime, Ema does her best to help out wherever she can.
Ema is troubled and hurt by the revelation she finds in the official copy of her family register. As she works through it, she gets to know a little more about Natsume, Louis, and the Asahina family.
With everything that has happened, the Asahina family's plan for a vacation overseas has been scrapped, so instead, they decide to go on a short trip closer to home and enjoy a little summer festival.
The college entrance exams are coming up fast and Ema learns how nice it can be to have the support of her siblings. But on the romantic front, many of them are also hoping for a response from her after the exams.
Now that the college entrance exams are over, Ema thinks carefully about what her brothers mean to her and goes through with her earlier decision to be more open with them.