Big Breasts Fantasy(2012)

Big Breasts Fantasy is a fantasy series set during a feudal era of warring kingdoms. Ryuuto commands one faction until political rivals orchestrate his downfall by sending him to hunt a dangerous demon. The creature he encounters is a succubus with a deadly reputation—she has already claimed numerous male victims. Rather than kill him, the succubus becomes infatuated with Ryuuto, drawn to his vitality and power. She chooses to aid him in his military ambitions, forming an unlikely alliance. As Ryuuto navigates treacherous court politics and battlefield conflicts, he must contend with both external enemies and this supernatural companion whose motivations remain as mysterious as they are unpredictable. The series blends historical warfare with fantasy elements and adult themes.