School Rumble S02 E24 Southern Rainbow of 2-C! Mysterious Yaakumo Island! The Seven Seas...!

All the students of 2-C go on Eri's cruise through the Pacific for their winter vacation. They eventually hit a reef and the engine breaks down, leaving them stranded. Hanai flies on his kite to an island populated by what seems to be a Mesoamerican civilization, featuring familiar faces.