Yari Tono (20) goes out to dinner with Waka Soyo (probably a high school student), a baby-faced senior who works at the cafe where she works part-time, on the advice of the manager.
There she discovers that Waka is actually a grown man, four years older than her.
Tono is puzzled by this shocking revelation, but...what if the senior guy at his part-time job is not actually a high school student?
Their relationship begins to take off...
バイト先のカフェで働く童顔の先輩、若 蒼夜（恐らく高校生）と、店長のはからいでご飯に行くことになった遠野 然里(20)。
そこで若が実は４歳年上の成人男性だということを知る。
衝撃の事実に困惑する遠野だったが・・・。
バイト先の先輩が実は高校生じゃなかったら・・・？
二人の関係が動き出す・・・