An extremely serious girlfriend, whom you absolutely cannot have, is used as bait by a gang of sluts staying at the same hotel while on a field trip. (Usagi Aika MKON-036)

She's my girlfriend, Aika Usagi. A bright student council president with excellent grades, we've been dating for a year, but we're too serious about it to have sex. However, one day during a school field trip, she was taken advantage of by some strange college students...