First lesson - newcomers

Second lesson - Mat

Third lesson - Jungle Boogie

Fourth Lesson - Manhunt

Fifth lesson - Survival

Sixth lesson - The divine key

Seventh lesson - Burning fangs

Eighth lesson - Love letter

Ninth Lesson - Where the rats crawl

Tenth lesson - The Zone

Eleventh lesson - Metamorphosis

12th lesson - In the arena

13th lesson - Massacre

14th lesson - G-Soldier

15th Lesson - Clone

16th lesson - Provocation

17th lesson - A true man

18th lesson - Brother & Sister

19th lesson - The Principal

20th lesson - Home run

21st lesson - Sub Zero

22nd lesson - Dogs of war

23rd lesson - Final Effort

24th lesson - Tora! Tora! Tora!

25th lesson - The need for freedom

26th lesson - The power of love

27th lesson - Creatures

28th lesson - Purgatory

29th lesson - The other

30th lesson - Requiem

31st lesson - Monster wars

32nd lesson - An important decision

33rd lesson - Friends...

34th lesson - The God's Trap

35th lesson - Graduation

A reform school for juvenile delinquents established in 200X is actually a government-sponsored laboratory, which makes ultra-human warriors with genetic modification. Three new kids enter the school. Itsuki, who is actually a girl dressed as a boy so she can get into the school to look for her lost brother; Mei, a very quiet, mysterious boy; and Gentaro, an energetic boy who is easily elated by flattery. The three revolt against the school rules and cause the other students to riot. The school turns into a battlefield.