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TV-PG

S1 • E1
Wataru Minakami is the number 1 student at Victory Cram School. He fails the high school entrance exam unexpectedly. Wataru lives with Jeeves but Jeeves is to take care of him until he graduates from middle school. Somehow he is taken to an island where Stargazer's Hill West Univ. is. He starts his life on his own there. He meets Karen, Sakuya, Kaho and Hinako. They tell Wataru that they are his younger sisters.

S1 • E2
A chain of initially unexplained events leads Wataru to meet his eight other sisters.

S1 • E3
Wataru and his sisters go on their first day of school, but Wataru is feeling the pressure to watch over them.

S1 • E4
Wataru helps Hinako search for her teddy bear, even if that teddy bear only appears in her dreams.

S1 • E5
The sisters are beginning to be suspicious about the numerous e-mail messages Wataru receives. So they each send their own.

S1 • E6
Wataru plays a prince in a play. His twelve sister get into the act, too.

S1 • E7
Simple fun with the laundry turned into play as the sisters dress themselves up as brides.

S1 • E8
Wataru spends a day with Marie. Marie, however, becomes sick because of a downpour.

S1 • E9
Wataru spends his initial summer days with his sisters.

S1 • E10
Mamoru teaches her Big Bro Wataru how to swim.

S1 • E11
Wataru and his sisters set out in an underwater tour in a submarine constructed by Rinrin.

S1 • E12
After a mishap involving Rinrin's submarine, Wataru and his sisters are marooned in an island with a very stylish beach house.

S1 • E13
Wataru reminisces his time with his sisters so far.

S1 • E14
Wataru proposes to the sisters that whoever has a request, he will grant them. Karen's request to have a light bulb that illuminates a painting changed ends up with the two spending their time together.

S1 • E15
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.

S1 • E16
A sports festival at Star Gazers Hill West University is coming up, something which Kaho looks forward to because she can cheer for her brother.

S1 • E17
Haruka, being shy around her Beloved Brother Wataru, tries to ask him to take her out to the ball.

S1 • E18
While exploring Chikage's mind/world, Wataru doesn't notice that he is having an out-of-body experience.

S1 • E19
Shirayuki prepares some bento as a surprise for her Elder Brother Wataru.

S1 • E20
Wataru celebrates Christmas with his sisters.

S1 • E21
Rinrin introduces her latest invention to Bro Wataru a clone of herself.

S1 • E22
When Mami damages the Christmas gift Wataru gave his sisters, Kaho blames herself and enlists Yotsuba to help get it fixed while deterring everybody else's attention. But the notion of a thief running loose soon runs amuck with all missing some items.

S1 • E23
Wataru's friend Akio arrives at the island for a visit, but his arrival makes Mami worried instead.

S1 • E24
Akio tells Wataru that he had actually passed the exams. Will Wataru leave Promised Island because of this?

S1 • E25
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.

S1 • E26
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.