The elite Cosmo Academy attracts applicants from every stellar nation in the galaxy. One young hopeful is Tadatos Lane, an orphan esper from Terra. The final stage of the academy's entrance exam is a perilous mission simulation aboard an actual derelict starship. The applicants depart for the ships in groups of ten, but when Tada's crew arrives on the Esperanza, they are horrified to discover that they now number eleven. As the test progresses, things go awry and the atmosphere grows increasingly tense. The crew members begin to suspect sabotage, and Tada appears to be the likely culprit.

Includes a short story called Seireigari which was later republished as a bunko volume under the name. It includes the same stories featured in this manga.

Volume 13 of Hagio Moto Works:

1. Bianka
2. Tou no Aru Ie
3. Cake Cake Cake
4. Sara Hill no Seiya
5. Sangatsu Usagi ga Shuudande
6. Poe no Ichizoku 1
7. Poe no Ichizoku 2
8. Poe no Ichizoku 3
9. Poe no Ichizoku 4
10. Cabbage Hata no Isan Souzokunin
11. Thomas no Shinzou 1
12. Thomas no Shinzou 2
13. 11-nin Iru!
14. Zoku 11-nin Iru!: Higashi no Chihei, Nishi no Towa
15. Kono Musume Urimasu!
16. Tottemo Shiawase Moto-chan
17. American Pie

Note: Won the 21st Shogakukan Manga Award for Shoujo in 1975 (tied with Poe no Ichizoku).