When unlucky high school letch Issei is murdered by his first-ever girlfriend on his first-ever date, who should jump to his rescue but the hottest girl in school, Rias-senpai! She informs Issei that he's been reincarnated as a demon and that it's about time he got to work-for her! Caught in the bosom of an age-old war between angels and demons, Issei soon discovers that being enslaved by a demonic beauty isn't quite all that it's cracked up to be!

Is love in the air between lowly servant Issei and his mistress, the bewitching Rias?! Reincarnated as a demon by Rias, the school beauty, Issei finds himself in servitude to his devilish mistress. But when Issei befriends Sister Asia, a nun from the Church, which is widely known to be hostile to demonkind, he's practically asking for a target on his back-as Rias is quick to inform him! Worse yet, when the good sister is kidnapped by a fallen angel, Issei rushes to her aid! But little does...

AN AWESOME POWER IS UNLEASHED...WITH THE HELP OF THE PRESIDENT'S CHEST?! Now that training is done and Rias's peerage is back together again, it's time to party! With just one day before the big game, tensions are running high, and things only get worse when some party crashers arrive! Issei is eager to show off the results of his training, but he still can't activate his Balance Breaker...or can he? Looking at Rias, his eyes drift downward, and he realizes what he must do...Is there room ...

A conference between devils, angels, and fallen angels?! Kuou Private Academy will never be the same!! Devil King Sirzechs pays a visit to the Hyoudou household, and he's got some astonishing info for Issei and the gang! Later, the beautiful swordswoman Xenovia too has a shock in store for Issei when she asks him a question that's been on her mind: "Will you have a child with me?"......Can she be serious?!

The fateful rating game has finally begun! Rias and her team may be hot stuff, but they find themselves struggling against Team Sohna and its members, who are putting their very lives on the line! When things look desperate, Issei's strongest-ever technique explodes forth! And it's coming for Team Sohna's...boobs?!

Issei's on a rampage?! "President Rias's virginity is gonna be mine!!" President Rias, the beautiful young devil, is betting her engagement on the outcome of a "rating game," and Issei's joining the fight. But does he even stand a chance against Riser's harem of devil girls...?!

"Would you like to have a fling with me?" Akeno-san drops a bombshell?! Issei has just started cohabiting with his beloved President Rias, so he's all "viva sexy time!" But will Akeno-san's proposition lead to a deadly lovers' quarrel?! And what will Issei do when faced with a battle over the holy swords?!

"I wanna do dirty things with the President!" Issei wildly pitches this explosive straight ball at an all-important conference! Archangels, devil kings, and fallen angels come together at the "Three-Way Deadlock Conference," but a mysterious power crashes the party to attack the peace-seekers...! And when a dastardly bunch of villains sets its sights on Gaspard's unique powers, Issei gives them a taste of his raging fists, all to protect his dear kouhai!

Summer's here, and before anyone knows it, the rating game between the Gremory and Sitri houses is scheduled to take place in the devil realm! Issei and the gang jump right into some hellish training, but something's not right with Koneko-chan...?

I'm gonna suck on the president's boobs! The fight over the holy swords heats up, and so do Issei's passions! As devils, fallen angels, and agents of the church all vie for control of the stolen Excaliburs, devil sword user Kiba's hidden past comes to light! Friendship and hot-blooded lust collide in this mix of school romcom and fantasy war games!!

"Hold me, Issei." ...Are you serious, President?! Issei Hyoudou, recently brought back to life as a devil, works hard every day in pursuit of his ultimate goal--to become the "Harem King"! Meanwhile, a handsome aristocrat, Riser Phoenix, makes his entrance, claiming to be engaged to President Rias... Her reaction, though, is a surprise to all!