On the first day of junior high school, Mato Kuroi happens to run into Yomi Takanashi, a shy, withdrawn girl whom she immediately takes an interest in. Mato tries her best to make conversation with Yomi, wanting to befriend her. At first, she is avoided, but the ice breaks when Yomi happens to notice a decorative blue bird attached to Mato's phone, which is from the book Li'l Birds At Play. Discovering they have a common interest, the two form a strong friendship. In an alternate universe, the young girls exist as parallel beings, Mato as Black★Rock Shooter, and Yomi as Dead Master. Somehow, what happens in one world seems to have an effect on the other, and unaware of this fact, the girls unknowingly become entangled by the threads of fate.

A spin-off of Lucky Star. Centers around big sister Hinata Miyakawa and little sister Hikage Miyakawa's impoverished daily life at home (due to Hinata's wasteful habits) and Hikage's life at elementary school.

Once upon a time, the demon lord Rchimedes spread terror throughout the world, until he was eventually sealed away by the legendary hero Creasion. Since then, a thousand years have passed peacefully. However, a mysterious hole has opened up between the demon and human spheres, and countless demons have surged into the human realm once more. Coming to the conclusion that Rchimedes would soon return to wreak havoc, a human king summons the possible descendants of the legendary hero—all 75 of them. Unfortunately, after so long, it was too difficult to pinpoint his true descendants. Among the lionhearted prospects is the amateur adventurer Alba Frühling. His skills may not be top-notch, but he is accompanied by the talented soldier Ross, who helps the young hero whenever he is in a pinch...or at least, he is supposed to. Though undoubtedly a skilled warrior, Ross is actually both sarcastic and sadistic, and hence revels in Alba's suffering. Senyuu. is a comedic adventure following the unlikely duo as they struggle in their endeavor to defeat the demon lord, meeting various eccentrics along the way.

Unaired episodes of Senyuu. released with BD/DVD volumes. 1. Yuusha, Nagurareru. / Nise Panda no Seitai (Vol. 1) 2. Shitsujichou no Tabi Sono 1 (Vol. 2) 3. Shitsujichou no Tabi Sono 2 (Vol. 3) 4. Gakuen Senyuu.: Seishun Monogatari (Vol. 4)