OVAs based on the "past arc" of the series, which spans the 14th through 17th volumes of the manga.

Cocotama are tiny gods born from the thoughts and feelings of objects that people use with great care. The fact that Cocotama wear part of the egg they hatch out of as underwear is proof that they are still apprentices. The Cocotama use a mysterious magic, and they train hard to be of use to humans and to become full gods. They live inside human houses and stealthily move around to help humans find things they have lost, although they make many mistakes.

Short episodes that introduce the Cocotama's from Kirakira Happy★Hirake! Cocotama TV series.

In the franchise, "Cocotama" are tiny gods born from the thoughts and feelings of objects that people use with great care. The fact that Cocotama wear part of the egg they hatch out of as underwear is proof that they are still apprentices. The Cocotama use a mysterious magic, and they train hard to be of use to humans and to become full gods. They live inside human houses and stealthily move around to help humans find things they have lost, although they make many mistakes.

At the end of the last summer vacation of high school, Youta Narukami spends his days preparing for the university entrance exams, when a young girl named Hina suddenly appears, proclaiming herself as the "god of omniscience." Youta is confused and does not believe Hina when she tells him "The world will end in 30 days." After witnessing Hina's God-like predictive ability, Youta begins to believe her powers are real. Hina, who is innocent and childlike despite her supernatural powers, decides for some reason to stay at Youta's home. Thus begins the start of their lively summer before the end of the world.

At the end of the last summer vacation of high school, Youta Narukami spends his days preparing for the university entrance exams, when a young girl named Hina suddenly appears, proclaiming herself as the "god of omniscience." Youta is confused and does not believe Hina when she tells him "The world will end in 30 days." After witnessing Hina's God-like predictive ability, Youta begins to believe her powers are real. Hina, who is innocent and childlike despite her supernatural powers, decides for some reason to stay at Youta's home. Thus begins the start of their lively summer before the end of the world.

God has abandoned the world. As a result, life cannot end nor can new life be born, and the "dead" walk restlessly among the living. Granting one last miracle before turning away forever, God created "gravekeepers," mystical beings capable of putting the dead to rest through a proper burial. Ai Astin, a cheerful but naïve young girl, serves as her village's gravekeeper in place of her late mother. One day, a man known as Hampnie Hambart, who is supposedly Ai's father, arrives and kills all the people in her village. Having lost her village and with no plans for the future, Ai decides to accompany the mysterious man on his journey. As she travels the land, the young gravekeeper strives to fulfill her duties, granting peace to the dead and assisting the living, while at the same time learning more about the world that God left in this tragic state. [Written by MAL Rewrite]

Narumi Fujishima isn't your typical high school student. He's never really fit in and has become increasingly more isolated from his fellow classmates. But he's not alone, and when Ayaka, the sole member of the Gardening Club, introduces him to the reclusive girl who lives above the ramen shop, Narumi enters a whole new secret world. Alice is a NEET, someone who is Not Employed, being Educated or in Training, but as Narumi quickly discovers, that doesn't mean that she does nothing all day. In between tending to her small army of stuffed bears, Alice is an expert hacker and a very exclusive private detective. To his surprise, Narumi finds himself drafted as one of the strange-but-elite team of associates that Alice has assembled from her NEET acquaintances. Together they'll battle gangs, thieves, murderers, and drug lords. And in the middle of it all, Narumi will find his life changing forever! (Source: Sentai Filmworks)

In a world where everything is programmed and operated by mysterious monsters called Promin, all troubles (bugs) that happen around are caused by Bugmin, bugged Promin. With the help of space dog Wanda, a boy named Yuuto tries to catch as many Bugmin as possible before serious consequences emerge.

Despite lacking the skills suited for his role on the Metropolitan Police Department investigative team, Totomaru Isshiki wants to solve murders and help people. Following the advice of one of his seniors, he ventures out to enlist the aid of the reclusive Ron Kamonohashi. Five years ago, Ron was the most promising detective from the illustrious Detective Training Academy Blue; yet for reasons unknown to the public, he sank into obscurity. Totomaru expects a well-dressed, composed man; but what he gets is a messy-haired and uninhibited eccentric. After years in solitude, Ron barely resembles his former self and he refuses to even hear out the detective. However, as quickly as Ron rebuffs, he flips on a dime and dives headfirst into the current serial murder case. The true reason Ron withdrew from the detective world was not from lack of desire, but rather from something out of his control—and Totomaru might just be the key for his return to his former calling. Together, the wide-eyed officer and deranged detective tackle each mystery that comes their way.

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Senou Natsuru is your normal, everyday high school student. However, one morning he wakes up and finds himself turned into a beautiful girl. A stuffed tiger Harakiri Tora tells him then, that he has been chosen to be a Kämpfer (German for "fighter"), who has to fight other Kämpfer with either guns, swords or magic. Natsuru has been granted great strength and fighting abilities on top of the power to use magic, but finds out that only girls can be a Kämpfer. Left without a choice, he is forced to turn into a girl again and again to fight other Kämpfer — to survive.