She's the Strongest Bride, But I'm Stronger in Night Battles: A Harem Chronicle of Advancing Through Cunning Tactics (Manga) Vol. 2

CONQUER THE WORLD, ONE BED AT A TIME!

The invading army sent by the Kingdom of Alexa is no match for the Blood Barbarian Lady Marida, nor the Elwin family! Not only is the army crushed, but Marida claims new territory and a new concubine! In gratitude, the Demon King summons Marida, Lord Burest, and newly married Albert to the royal court, but the celebration takes a turn for the worse when Albert's ambition to procure a harem of wives for himself comes to light...