Record of Kurono's War

Kuro no Senki: Isekai Teni Shita Boku ga Saikyou nano wa Bed no Ue dake no You desu
クロの戦記 異世界転移した僕が最強なのはベッドの上だけのようです

Adaptation

Record of Chrono’s War: Apparently I’m Only the Strongest in Bed
Kuro no Senki: Isekai Teni Shita Boku ga Saikyou nano wa Bed no Ue dake no You desu· クロの戦記 異世界転移した僕が最強なのはベッドの上だけのようです
manga

Three years ago, Chrono Crawford found himself sent to another world on the day of his high school entrance exams. Today, he serves as both a lord and general commanding an army of demihumans. In a world where his soldiers face discrimination and hardship, Chrono must use his experience in both worlds to bring about equality for all races. But when a beautiful half-elf girl appears in his bedroom to confess her love, his mission gets a whole lot more personal! Is he ready to start navigating the sexy women of this fantasy world? (Source: Seven Seas Entertainment)

Adaptation

Kuro no Senki II: It seems that I, who has moved to another world, is the strongest only on the bed
Kuro no Senki II: Isekai Teni Shita Boku ga Saikyou nano wa Bed no Ue dake no You desu· クロの戦記Ⅱ 異世界転移した僕が最強なのはベッドの上だけのようです
manga

On the day of his high school entrance exam, a boy named Crono is suddenly transported to another world. He became the commander of the demi-human army, won many great victories, and is feted as a lord. He gathers beautiful women one after another... A royal-road war story with battles, domestic politics, and sex! (Source: Kadokawa, translated) *Note: Starts from Chapter 9 of the prequel, with a new version of Chapter 10 and 11.*