Goddess And I? WTF

Sojuro was in his second year of high school when the goddess Athena summoned him and his entire class. They were to go on a 50 reincarnation journeys before returning to their former lives.
Sojuro, however, is the only one not granted any skill or blessing after the goddess forgets he was there and grants his blessing to the popular boy.
Sojuro is made to go through the 50 reincarnation cycles without any skills and as a result, suffers many horrible reincarnations before returning back to his original world, only to be summoned by the goddess again. However, this second summoning has a surprised installed for both him and the goddess.