A serious and honor student in the class.Rena-chan, who can't imagine that she is shining against her uncle, is a hidden busty student whose G-cup breasts pop out as soon as she takes off her uniform.She just studies and is a good girl at home and at school.Even though she is embarrassed in front of her uncle, she wets her crotch.A naughty record of such a sober child hidden big breast Rena-chan and uncle.