Episodes released on DVDs bundled with the 14th, 16th, and 17th volumes of the Nisekoi manga.

#1: Oppai, Minorimasu! (Episode 13) A rumor is going about the school about how girls are disappearing and coming back ill and with their breast size decreased. #2: Oppai, Motomemasu! (Episode 14) While observing how the others do their jobs so they can do theirs better, Issei and Asia go with Rias to see if a coffin is cursed. During the investigation Issei is possessed by an Egyptian magician named Unas, It just so happens that Unas is just as perverted as Issei. Unas will only leave Issei's body if they can release Unas from the curse placed on him by a devil that Unas tried to make his bride.

Miaka and Taka (Tamahome's reborn out-of-the-book self) return to the Universe of the Four Gods to try and restore Tamahome's memories to Taka. This is not as easy as it sounds, however, when the evil Tenkou shows up to rain on their parade. He manages to thwart most of their attempts at getting Taka's memories back, and uses his newfound power to summon the Gods outside the book. (Source: ANN)

A series of 3-5 minute specials that were bundled with the HighSchool DxD DVD and Blu-rays. They are a stand alone set of episodes that are not a part of any story line in particular. Special 1: Going Sunbathing! - The Occult Research Club goes on a beach outing. Special 2: Issei's Private Training! - Issei is being given lessons in magic by Akeno. Special 3: A Little Bold, Koneko-Chan... Nyan! - Koneko accidentally has her personality reversed magically, making her incredibly sexually active and reversing her sexual preference. Special 4: The Untold Story of The Dress Break's Birth! - A few flashbacks of how Issei first found out and eventually perfected his special move, Dress Break. Special 5: Making Udon! - As part of a penalty for losing a bet, Sona and Tsubaki make udon for the Occult Research Club but the udon comes to life in a peculiar way... Special 6: Asia Transforms! - Asia wants to prove she is just as bad as any demon by using ideas found in Issei's magazines, going as far as dressing up like a harlot and seducing him. (Source: Wikipedia)