18+ Koko ga Uwasa no El Palacio

An almost road accident victim loses his memory after being pushed to a street power line pole to save his life. Not knowing his identity he is compelled to stay at his savior's residence, a gym and boarding house for female wrestlers, until he remembers. During his stay he becomes his savior's manservant and the gym's referee trainee.

(Source: MU)

Included one-shot:
Volume 4: Sebangou wa O (The Number On My Back is O)