Training Regimes of the World’s Strongest Women

Saikyou Onna Shishoutachi ga Ikusei Houshin wo Megutte Shuraba
最強女師匠たちが育成方針を巡って修羅場

Source

Training Regimes of the World's Strongest Women
Boku wo Nariagara Seyou to Suru: Saikyou Onna Shishoutachi ga Ikusei Houshin wo Megutte Shuraba· 僕を成り上がらせようとする最強女師匠たちが育成方針を巡って修羅場
novel

For the three strongest adventurers in the world, finding a man strong enough to be with them is a herculean task. He simply doesn’t exist. With that in mind, they decide to take on a perfect novice—the level-zero, unremarkable Cross Alacart—and train him up to be their perfect match. Freshly expelled from Adventurers’ school, Cross sets his eyes on redemption; training hard and learning to believe in himself along the way. Source: Comikey