Seventeen-year-old Utage Kinoshita lives and breathes for her favorite idol group, F/ACE—but the group's center, Tamon Fukuhara, occupies a special place in her heart. Every waking moment Utage dedicates to the thoughts of the wild and sexy Tamon, even taking on a part-time housecleaning job just to afford her fangirl lifestyle. What was supposed to be an ordinary job turns out to be anything but when Utage realizes she is cleaning the apartment of the very idol she so fervently admires! But adding to the surprise, Tamon is nothing like his on-stage persona; he suffers from severe anxiety and painfully low self-esteem. Keenly aware of the gap between their worlds, Utage cannot bear to see Tamon so depressed and decides to support him the best she can as his housekeeper. As time passes, Utage becomes more and more privy to the aspects of Tamon's life he reveals to nobody else. And the bond that forms between them soon leaves Utage wondering if she has accidentally crossed the sacred line between fan and idol.

In the beginning, God created the heavens and the earth. He also sought after a wide variety of animals to populate the planet. However, he felt that it was too tiresome to think of new ideas within his criteria. To address this problem, God appointed an organization—the Heaven's Design Team—to do the work instead! Shimoda is a newly-hired angel who serves as the mediator between God and the design team. As he steps into his role, he witnesses his coworkers conceive interesting ideas for many unique life forms according to God's desires. From giraffes and snakes to birds, anteaters, and everything in between, the possibilities for different animal species are endless!

In the 24th century on the planet Aqua, three girls—Akari Mizunashi, Alice Carroll, and Aika S. Granzchesta—continue to work hard toward achieving their goal of becoming Prima Undines: professional tour guide gondoliers. Luckily, the girls have the guidance of the three best Prima Undines in Neo-Venezia—Alicia Florence, Athena Glory, and Akira E. Ferrari—who are known as the Water Fairies in honor of their skill. With their help, the young apprentices train hard and work to overcome any situations that they find themselves in. Aria The Origination follows the hardships and daily lives of these three young girls, who are doing their best to improve as tour gondoliers in Neo-Venezia, a terraformed replica of Venice.

With its flickering streetlights, moldy back alleys, and noisy populace, the Second Kowloon Walled City, despite the squalor of its already-demolished predecessor, evokes a special kind of nostalgia that its residents find endearing. Amidst the walls of this fading yet beloved landscape lives Reiko Kujirai, a 32-year-old realtor deeply in love with her coworker, Hajime Kudou, who is two years her junior. Though they have their differences, the two get along well enough to experience the joys of the walled city together. However, everything starts to fall apart when Kudou, half-asleep, suddenly kisses Kujirai—seemingly reciprocating the feelings she has yet to confess. But when Kudou explains that he had mistaken her for someone else, Kujirai finds herself drawn into a series of events that lead her to a past she cannot remember.