Kimi O Mawashitai.

one day in the yamaguchi family's bathroom, in a roll of toilet paper, appears a mysterious (and tiny) girl named shin – for friends shini – who at first glance makes a stunning impression on nobuo, a simple middle school student. “and if i used all the paper,” thought nobuo, and a drop of sweat rolled down his temple – “would i see her then … na … naked ?!” and so it begins, a wonderful story of love, lust and … much more!