Inside the train station on a clear, sunny day.

"Hello~"

Unfamiliar greetings echoed here and there.
Groups of young ladies chatted excitedly about their plans, their voices light and cheerful.
It was the start of a three-night, four-day school trip for the Canary Girls’ Academy, a chance to experience the culture of the Kanto region.
Their itinerary was packed—churches, temples, amusement parks—all visited without a care for consistency.
The protagonist, Azabu Reiji, had been roped into going on this trip in place of his sister… while cross-dressing as her.
When will they find out?
With that thought weighing heavily on his mind, Reiji boarded the bullet train, feeling utterly miserable.
But to his surprise, no one seemed to notice. They all treated him as if he were his sister, striking up conversations without a second thought.
And, being the opportunist he was, Reiji started to relax. The all-girls environment began to feel… oddly pleasant.
Surrounded by sweet scents and the soft, refined chatter of the girls, he let out a small sigh of relief. His tense expression softened just a bit.

"……Reiji?"

Standing in front of him was the student council president, Kousaka Maki.
I’m done for!
And so, Reiji found himself stuck in a girls’ school trip, cross-dressing and surrounded by young ladies for three nights and four days.
A trip filled with constant heart-pounding moments!?

[Translated from the official website]