Peeping in the bath is a man's dream. Even though he knew he shouldn't do this, adolescent Koji had gotten into the habit of peeking at his stepmother Hikari's naked body while she was taking a bath. Today, as always, Koji was peeking at Hikari soaking in the bathtub. Then, perhaps because she was lonely with her father away on a business trip, Hikari began to grope her crotch, unaware that she was being watched... Excited by seeing his stepmother's lewd behavior for the first time, Koji accidentally made a noise. Hikari was furious when she realized she was being watched. However, Koji was no longer able to suppress his arousal...