Doukyo Shiteiru Kensei no Onna Shishou ga Kawaisugite Mainichi Shiawase desu

Eugene Dawson is a young man with a goal: to become strong. He trains under and lives with his mentor, Liza Parsandra, who is regarded as a Sword Saint. In terms of physical prowess, Liza is without equal, and despite her scatterbrained nature, Eugene still enjoys each day with his adorable mentor. However, her defenseless nature, drop-dead gorgeous looks and tendency towards unintentional skin-ship make training feel like an impossible task...?!

*"Is this really going to help me get stronger?!"*

(Source: Kadokawa, translated)