It's been 3 years since she became a teacher... Kaoru came to Tokyo on a school excursion with her students, who were only a few months away from graduating. However, what she hears on the bus is neither cheers nor singing voices, only the sighs of the students. That's no wonder, because Kaoru made a mistake and made a mistake in booking her accommodation and the date and time of the tour. The students, who couldn't even get into the theme park she was looking forward to, take action against Kaoru. A three-night, four-day school trip that even Kaoru will never forget begins.
