It's a Rumic World: 50th Anniversary Weekly Shonen Sunday

Ranma Saotome in his Female form was taking a walk within town with little notion that he was about to meet some unexpected characters. Such as Ataru Moroboshi who believes Ranma really was a girl tries to get her e-mail address and a date. Lum Invader, who was informed of a special gathering that was happening within the town. It wasn't long until Inuyasha and Kagome show up and when all five characters meet each other, it leads to a series of misunderstandings and fights.