Complete Molester: Until a Shy JK Falls

The protagonist works overtime every day.
In his boring daily life, his only salvation was his “commuter train.”
His hobby is watching and ogling schoolgirls on the train.
That day, he boarded the train full of anticipation.
But today's spot was a bust... no schoolgirls nearby.
Glancing out the window, he saw a train on a parallel track.
It was the “Chikinsan Line” he used to ride as a student.