This is light novel written by Kihara Hirokatsu, only the last chapter is in the manga format.

1. Kao 2. Toshoshitsu 3. Umi kara... 4. O-Bon 5. Engeki Happyoukai 6. Folk Dance 7. Shichigosan 8. Yuki no Futta Hi 9. Kuchibiru 10. Natsu no Sotsugyou Ryouko (The Summer Time Graduation Trip) - manga