Eureka Seven S01 E11 Into The Nature

Eureka's health continues to decline after realizing the connection between her and the Nirvash. At the same time, the Gekko encounters a strange phenomenon called a "Corallian." Despite her health, Eureka goes out in the Nirvash and is attacked by a new enemy - the Nirvash type "The End" - while inside the zone within the Corallian.