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由于母亲再婚，女高中生伊丝开始与新家庭生活在一起。为了与父亲以及四个个性鲜明的弟弟们打好关系，她作为“姐姐”干劲十足地努力做家务，但唯独与冷淡的长子源始终难以相处……

正当丝以为在成田家的新生活刚刚开始时，父亲却突然被决定调往北海道。丝为面临家庭离散的危机而烦恼。面对这样的丝，源却轻描淡写地对她说：“那你就去北海道吧。”深受打击的丝本想跟着父母一起走，却……

由于工作调动，父母去了北海道，兄弟姐妹们开始了仅靠彼此相依的生活。虽然对那几个自由自在的弟弟们感到头疼，但伊丝依然过着快乐的日子，然而她在期中考试中却考出了一个糟糕透顶的分数。这件事被洛发现后，她便请他辅导功课，然而……

宠物戈梅斯走失，大家开始寻找它。搜寻过程中，源不小心扭伤了脚。伊丝干劲十足地照顾源，但源却无法坦率地向她撒娇。正因为伊丝理解源那种不愿依赖他人的心情，才希望源能学会如何撒娇，于是她采取了行动……

久违地，父母从工作地回到了家，全家人决定一起举办烧烤聚会。在这期间，伊丝一直挂念着久未露面的三儿子柊。某天，伊丝在院子里中暑了，当她恢复意识时，眼前竟出现了一位陌生的天使……！？

Ito and Shu's party is facing their fiercest opponent yet. Can they overcome this challenge and break free?

It's summer, so the family goes to see Ito's friends. Back in school, Gen is forced to be a prince for a play?

Ito feels some way about Gen, but she’s not sure what exactly. Udagawa sees right through her and says it's...

Ito realizes she has romantic feelings for Gen. Raku finds out, and Gen overhears them talking about it.

Shu has a cosplayer friend?! Shu wants to meet this friend at an IRL event, but can he muster the courage?

Ito and Gen end up sightseeing alone on the school trip, and then something unexpected occurs…?!

It's Christmas and everyone is home! After a huge party, Ito learns this day is very special for the Naritas.

As Raku's out shopping on NYE, a woman asks to borrow his phone. Then she asks Raku for a favor...

Since Valentine's, Ito wavers between just confessing her love to Gen, and protecting the order of the family.

Since hearing how Gen feels, Ito is completely distracted and falls down the stairs...

Being rejected has torn a hole in Ito's heart. Gen also doesn't know how to act. What can be done to fix it?

Syu figures out how Gen really feels about Ito. To settle things, he challenges Gen to a fight.