Anime Crossover: A Slow Life in Tokyo

Tokyo is a vibrant city, though it can be a little frustrating. The country was founded during the Qin dynasty by Xu Fu, who brought three thousand boys and girls with him. During the Tang dynasty, the Eastern family led an army that conquered the entire country in three months. Since then, it has been a territory of Xia known as Sakura Province. As the family that conquered the province, the Eastern family naturally became its foremost clan. The Shiinomiya, Shiina, and Yukinoshita families followed, becoming known as Tokyo's Four Great Families. Together, they divide up the spoils of Sakura Province. Dongfang Zangyu (Su Zangyu) is the only son of this generation of the Eastern family, and naturally wields immense power. In his previous life, Su Yu was a nine-to-five office worker. Now, he only wants to enjoy a slower pace of life. But will things really go as he wishes? P.S. This story has multiple heroines, so don't read it if that's not your thing. Kaguya, Yukino, the five Nakano sisters, Shiina Mahiru, and Shiina Mashiro are all included, and there may be other characters too. I'll write whatever comes to mind.