Genshoku no Kotou

The story begins with a man's letter. The man finds himself in a cave on a deserted island without memories of his past. The island is a hellish landscape full of monsters competing for survival. There is a huge castle gate with countless human remains around it, and inside the gate are tribesmen who speak a foreign language. The man decides to observe the tribe for the time being, but...
(Source: Sukima, translated)

1. Bokura no Sensei (ぼくらの先生)
2. Oooi Namazu-kun (おーいナマズくん)
3. Kawaii Shoujo (かわいい少女)
4. Ningyo (人魚)
5. Genshoku no Kotou (幻色の孤島)
6. Baka Yuki (ばか雪)
7. Mizu no Naka no Rakuen (水の中の楽園)
8. Tsumetai Ase (つめたい汗)