Other comics The younger sister is Siskon and the older brother is troublesome (3) / Yo Shimizu COMIC POOL

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Yu Hasegawa, the most beautiful boy in the school, is a severe syscon who dotes on his younger sister Yui. He hid the fact that he was a syscon at the request of his younger sister, but the "secret" is known by Koyuri Shichi Kida, a new student. What was the action that Koyuri took in front of the brothers and sisters Hasegawa who are anxious about the syscon being discovered in the school?