お兄ちゃん, 朝までずっとギュッてして! / Onii-chan, Asa made Zutto Gyutte Shite!
お兄ちゃん、朝までずっとギュッてして！ 女未あかね編（3巻） / Onii-chan, stay tuned until morning! Akane Onna (Volume 3)
The older brother of the Onami family lives with four younger sisters, Sora, Akane, Kohaku, and Sumi.
Having suffered from severe asthma when he was little, his daily routine is to “sleep with one of his sisters.”
One day, my parents, who are also researchers, ordered me to conduct a demonstration experiment of “immunity improvement by hugging.”
“Hug your sister with love for at least 10 seconds before going to bed every day.”
And if some conditions are not met, there will be no effect.
Aside from the confused older brother, the younger sisters decorated the condition with a frame in the living room as the five rules of hugging a woman.
1. Hug with your sister every day 2.
Hug for more than 10 seconds
3. Smell properly
4. Start over when you get away
5. Hug with affection
Your brother chooses Akane as his hug partner.
With a hug that wraps his arms around his neck and hugs him, his older brother is thrilled because he is aware of Akane’s feminine body, but he does his best not to realize that he is his sister.
One day, when I returned to my room after taking a bath, I witnessed Akane, who was in charge of cosleeping, doing H alone.