The Awaken Guyver I - S1.E16

After Guyot's attack, Tetsuro, Agito and Masaki are missing. Worried for their friends and by Sho's inability to transform, Mizuki and Sho hide in the forest.

Aptom finds them and, to confront Guyver and have revenge for the other Lost Number, reveals to Sho the terrible truth about Fumio's death. The trauma is so strong that Guyver's powers are awakened, allowing Sho to successfully fight against his opponent.