65 million years ago, the knights of the Ryusoul Tribe were selected to participate in a war campaign against the dictating Druidon Tribe who sought to rule Earth. But the Druidon's war campaign was halted by the meteor that brought the age of the dinosaurs to an end, forcing them to flee into space. Meanwhile, the Kishiryu were placed in a deep sleep as a failsafe should the Druidon return. The chosen knights choose to live in peace while passing their mantle down across generations. In the present day, the Druidon return to reclaim Earth as the current generation of knights, the Ryusoulgers, battle them with the support of Ui Tatsui and her father Naohisa Tatsui.
Asuka had once realized her goal to become a teacher, but after a gutting failure, she gives up her dream profession and becomes extremely withdrawn. After a series of events, she finds herself becoming a live-in housemother for a dorm… where the boy-band septet 8LOOM live together! At the dorm, she is reunited with her former student Dan—as a teacher, Asuka used to encourage him to go for his dreams. Inspired by Dan's leadership in the band and his passion for making his dream come true, Asuka, too, regains the passion she had in her teaching days and comes to terms with her own failure.
The story centers on the daily life of college dorm roommates Yumi Irisu and Ruka Kujirai. Ruka, the older of the two, is constantly penniless despite her being active in a band. Irisu works part-time at a second-hand bookstore.
