Age: 14 Birthday: September 29, 1987  Height: 152cm Weight: 39kg  Shinobu, who is Mikoto's real sister, is a ninja, but became infatuated with samurai and set out on a journey to train herself.  Because of her horrible sense of direction and clumsiness, she gets lost deep in the forest and does not find out about Ikuto's arrival until much later. Hearing that Ikuto's a great sword master who defeated the Leader of the North in a swordfight, she stubbornly persists in her request to spar with Ikuto for days until he agrees to do so. After Ikuto 'defeates' her, she becomes Ikuto's disciple in swordsmanship, owing again to her extreme stubbornness that Ikuto doesn't wish to put up with after already experiencing it.   Because Shinobu  is so obsessed with becoming strong and sparring, she doesn't know 'love'. This has been illustrated quite a few times. During her match with Ikuto, when he accidentally grabbed her breasts, she didn't know what kind of feeling she had at that moment. At another time, when every other girl was hoping that Ikuto would pay them a visit in their room because that would be a sign he loved that girl the most, Shinobu thought Ikuto would come to her room to spar. She does however start to become jealous of others receiving attention from Ikuto such as Rin and Suzu, once seeing Suzu be patted on the head by Ikuto, she becomes fixated on Ikuto praising herself in the same manner.  Like most inhabitants, Shinobu also has an animal who follows her day and night, a cow named 'Beef Jerky'.

After a terrible argument with his father, Ikuto makes a hasty, fateful decision to run away from home. Going from runaway to stowaway, Ikuto’s luck lands him on a ship heading right into the path of a huge storm! When it rains, it pours — or in Ikuto’s case, it pours so badly that he washes overboard and wakes up on a deserted island. Well, an almost deserted island. The island is populated by nothing but beautiful girls, all of whom want Ikuto to choose them as his bride.<br>
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(Source: HIDIVE)

Ikuto Touhouin is a 14-year-old boy, who had a fight with his father and ran away from home. He later boards a ship overseas, but a huge storm hits and sinks the ship. After spending a week drifting in the ocean, he arrives in an island, with the only exception that all the people there act like people from the Meiji era, and that they are all females! The girls were unable to come into contact with other people, let alone males, as there were whirlpools surrounding the island, making it impossible to leave. Now that these love-starved women finally come into contact with a male, what will happen now?
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(Source: Anime News Network)