An Urusei Yatsura/Ranma/Sister Princess X-over with influences of The Senior Year. What might have happened if Ataru was NOT bonded to Lum...but to someone else? And what might have happened if Negako Moroboshi gained her life earlier than expected? Need we mention twelve half-sisters? Set after the end of both the UY and Ranma manga series and after the first SisPri anime series.

Ranma X Urusei Yatsura. Furinkan and Tomobiki High School are trading a student for the week. The new guy, Ryuunosuke, is an instant hit, but it seems Ranma isn't the only one with a little secret...