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I have read a manga similar to Kenshin No Keishousha around 2013-2014, but I can't remember the title, all I remember is this guy who sees girls naked.

They talk with the principal and the girl challenges the guy to a sword fight. The winner becomes master or something like that. The school is a place where people summon swords magically or something like that. The girl summons her sword and the guy defeats her fast with his katana.

Then the girl asks the principal who the guy is. The principal says he is someone who was disowned by his family and has been repeating school for 2 years (not sure but I think it was 2), since his family is powerful and had influence at the school. The principal pitied him and removed the things hindering the guy from graduating (she was not the principal 2 years ago).

The principal also says the guy was able to beat her. The girl and the guy become friends and girl tries to make moves on the guy.

The guy and the girl live in same room.

Everything I have said above is from chapter 1 to 3 or maybe 4/5 but not more than that.

The guy had a little sister if I remember correctly, and the girl is like a princess. I think it was harem.

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put on hold as off-topic by JNat 7 hours ago

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I don't know what Kenshin no Keishousha is, but Rakudai Kishi no Eiyuutan fit your description:

Color spread Chapter 1

Summary from mangaupdates:

In a time and place where one’s soul can be morphed into a weapon, there are modern-day magicians called Mage-Knights. Although Kurogane Ikki is a student at an institution that trains Mage-Knights, he has no particular talent in magic and is labeled the "Failure Knight" or "Worst One." Getting way less than average marks in the scorings, he was forced to repeat a year. But with the arrival of a new head of the institution, a new rule was created: knights whose abilities are compatible, as decided by the board, must share rooms and attend practice and training together throughout their school years to bring up their abilities to the max. It is a rule to implement the absolute verdict of ability.

Ikki’s roommate, Stella Vermillion, turns out to be a princess of another foreign country. Stella is a Rank A knight: the type of genius in magic who only appears once a decade. When Ikki walked in on her while she was changing her clothes, it caused a huge misunderstanding (since neither yet knew of the new rule) which eventually ended up in a duel between the two of them. The punishment (or as some might see it, the prize) of the losing side is Eternal Submission to the winning side. Forced to live the same room and practice magic together throughout all their school years, how will Stella and Ikki’s relationship evolve?

The original manga (in Japanese) can be read on Gangan Online.

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Thanks man that's what i was looking for – user7858 Aug 4 '14 at 13:32

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