Ossu! Renai Gakuen(2005)

Ossu! Renai Gakuen

1-2) Ritsujoukan Crisis (立城館クライシス)
Caught in the middle!
Tagosaku Yamakawa just moved to the big city to be a housekeeper at an all boys boarding school, even though he's only sixteen. However, part of his job is to control the unruly class G. This includes an Italian exchange student obsessed with figurines, a 30-year-old guy with a gun(?), Kazamatsuri, who thinks of Tagosaku as his pet gerbil, and various other scary guys. Will Tagosaku survive?

3) Ritsujoukan Crisis: After 15 (―立城館クライシス―After15)
Relationship between the teacher and old army guy.

4-6) Gaku☆Ran Nights (GAKU☆RANナイツ)
A shoujo story