Episodes

After failing to pass a high school entrance exam, Wataru is unexpectedly whisked to Promised Island, where he meets four girls who turn out to be his sisters. || Wataru Minakami is sent away from home to Promised Island to attend high school there. He falls off the ferry and almost drowns, but he`s saved by a girl who calls him "Big Brother!" Source: crunchyroll

A chain of initially unexplained events leads Wataru to meet his eight other sisters. || As Wataru gets used to life in the mansion, many mysteries await him. There`s a blistering-hot kimchi gratin no one remembers cooking. Then, he encounters a monster out in the woods! And finally... he meets even more sisters of his! Source: crunchyroll

Wataru and his sisters go on their first day of school, but Wataru is feeling the pressure to watch over them. || Wataru goes to school for the first time. During class, he fends off all his sisters vying for his attention... and has to do the same thing again at home! Tired of it all, he attempts to escape from the island. Source: crunchyroll

Wataru helps Hinako search for her teddy bear, even if that teddy bear only appears in her dreams. || Hinako, the youngest of the sisters, is missing! She left a note that she`s "going to look for Mr. Teddy Bear." Kaho asks Wataru to go look for her, and it ends up being quite an adventure for them both. Source: crunchyroll

The sisters are beginning to be suspicious about the numerous e-mail messages Wataru receives. So they each send their own. || Hinako sees Wataru using his PC and decides she wants to send him an E-mail. All his other sisters join in, sending him updates on what`s going on in their lives. But who is his mysterious pen pal, "Aiko?" Source: crunchyroll

Wataru plays a prince in a play. His twelve sister get into the act, too. || Hoping to win a mysterious prize, the family decides to perform a play together. Wataru naturally ends up in a starring role as the prince. Then he has to decide which sleeping beauty to awaken with a kiss! Source: crunchyroll

Simple fun with the laundry turned into play as the sisters dress themselves up as brides. || The wind blows a sheet onto Sakuya, and Hinako tells her she looks like a bride. One thing leads to another, and all of Wataru`s sisters end up making wedding dresses and staging an entire wedding with him. Source: crunchyroll

Wataru spends a day with Marie. Marie, however, becomes sick because of a downpour. || Wataru goes to a bookstore, and the shy, frail Maria and her loyal dog Michael accompany him. They have a pleasant time in town together... but then the rain starts pouring and Maria falls ill! Source: crunchyroll

Wataru spends his initial summer days with his sisters. || Summer has arrived at last! Wataru and the girls enjoy cold somen noodles, try on new swimsuits, and finally play in the mansion`s pool. Source: crunchyroll

Mamoru teaches her Big Bro Wataru how to swim. || The bright summer days continue, and Wataru decides to learn how to swim. The athletic Mamoru takes the lead in teaching him. Can he overcome his lack of talent? Source: crunchyroll

Wataru and his sisters set out in an underwater tour in a submarine single-handedly constructed by Rinrin. || The family goes on a trip, which turns out to be on Rin Rin`s submarine! Wataru has a great time with all of them, but then disaster strikes... Source: crunchyroll

After a mishap involving Rinrin's submarine, Wataru and his sisters are marooned in an island with a very stylish beach house. || Wataru, his sisters, and Mami are stranded on a desert island! They fashion new clothes and continue enjoying themselves. But the island has a secret! Source: crunchyroll

Wataru reminisces his time with his sisters so far. || While writing a letter to his friend Akio, Wataru reminisces about his summer vacation and the time he spent with each one of his sisters. Source: crunchyroll

Wataru proposes to the sisters that whoever has a request, he will grant them. Karen's request to have a lightbulb that illuminates a painting changed ends up with the two spending their time together. || Wataru goes shopping in town with Karen. They have a pleasant day, but then Karen gets lost in the rain while trying to reunite two kittens! Can Wataru find her again? Source: crunchyroll

The wind blows away Aria's ribbon (which her Mon Frère Wataru gave her). She is then accompanied by a strange old man to help her find it. || Aria`s ribbon gets blown away by the wind, and she goes to look for it in town, accompanied by a mysterious old man. Then Wataru goes to look for her as well when he notices her missing. Source: crunchyroll

Kaho continues to fumble on her cheerleading routine. She however tries her best to cheer for her Brother Wataru in the autumn sports festival. || Kaho, the cheerleader, is excited to cheer for her brother at the sports festival. But she gets depressed at her own clumsiness. Wataru will have to give her courage! Source: crunchyroll

Haruka, being shy around her Beloved Brother Wataru, tries to ask him to take her out to the ball. || While in town with Haruka, Wataru has an escalator accident and sprains his ankle! Will this interfere with their dream of going to the dance together? Source: crunchyroll

While exploring Chikage's mind/world, Wataru doesn't notice that he is having an out-of-body experience. || Wataru has a strange dream, and wakes up as an invisible ghost! Can the occultist among his sisters, Chikage, return him to his body... or is she the one behind this? Source: crunchyroll

Shirayuki prepares some bento as a surprise for her Elder Brother Wataru. || Shirayuki brings Wataru a boxed lunch at school. Then she cooks more and more, until Wataru`s stuffed full! He`ll have to find a way to turn down her meals without hurting her feelings. Source: crunchyroll

Rinrin introduces her latest invention to Bro Wataru—a gynoid clone of herself. || Rin Rin builds a mechanical copy of herself to help take care of Wataru, but Mecha Rin Rin keeps breaking down. Wataru gives her what help and reassurance he can. Source: crunchyroll

Wataru helps Yotsuba catch the thief known only as Clover. || All sorts of things are going missing around the mansion! Yotsuba, girl detective, is determined to find the culprit. But what if it`s one of them? Source: crunchyroll

Wataru's friend Akio arrives at the island for a visit, but his arrival makes Mami worried instead. || Wataru`s old friend Akio comes to visit Promised Island! All his sisters are excited to meet their guest. Except for Mami... Source: crunchyroll

Akio tells Wataru that he had actually passed the exams. Will Wataru leave Promised Island because of this? || Wataru finally has the chance to return to Tokyo, but he struggles with the decision. One by one, his sisters find out that he might leave... Source: crunchyroll

The sisters' house feels empty as they miss their brother and anticipate his return with all their hearts. Meanwhile, Wataru is back in Tokyo with Akio and is ready to forget his memories in Promised Island. || The sisters try to get used to life without Wataru. And back in Tokyo, Wataru tries to get used to life without them... Source: crunchyroll

Against Akio's expectations, Wataru returns to Promised Island for good. The sisters become so happy for his return that they cherish every moment with him. || After being challenged by Mami, Wataru makes his decision. He returns to live happily with his sisters once again. Source: crunchyroll