Age 15 by Asagi Ryuu — Ongoing
An Innocent third year middle schooler knows adult kisses.
Third year middle school student Anna has begun living with fourth year college student Ema, and is swung about by the tactless Ema.
Drawn in by the romantic designs of Ema, the once perfectly ordinary Anna, is brought into the adult world.
And then, she is shown the scene of a kiss between two girls... (From the back cover.)