Ultraman Tiga: S1 E41 - A Friend From Space Ultraman Tiga

A spaceship carrying two of Shinjo's best friends is attacked by some entity and forced into an emergency landing. Shinjo runs to the rescue and takes down a monster that suddenly appears. However, it is his best friend whose body was infected by Mysterious Parasite Irudo. What does Shinjo do with the extreme feelings of guilt?