Vol.1: The protagonist Toa, and her childhood friend Miu
would do everything together. They were just like family.
To Toa, that was such bliss that she wished it would last forever.

However, as time passed and they changed both physically and mentally,
their circumstances and the reactions of others changed in tow.

On top of that, something happened to a "part" of Toa's body,
and due to a certain event, Miu became aware of that change.

He shows concern about it of course, but...

Toa thought her cute childhood friend was harmless... but looks can be deceiving.
It turns out that he had been sexually training her while she was unconscious...
A sexually naive mind, experiences consecutive orgasms from her sexually primed body.

Official Translations:
English, S.Chinese, T.Chinese, Korean

Vol.2: Protagonist Toa and longtime friend Miu share a family-like bond and do everything together. The two finally confess their mutual feelings and become lovers. Becoming lovers causes Miu to lose his restraint, eagerly desiring Toa whom he had always loved and seeking her passionately every day. Toa continues accepting Miu's demands, wanting to see Miu happy. However, Toa's body can't keep up with her feelings, and eventually her daily life starts falling apart Noticing this change in Toa, Miu takes action...

A story about being desired to the point of fainting by a cute friend who has become your lover and being instructed in masturbation.

Official Translations:
English, S.Chinese, T.Chinese, Korean