Even if normal was easy I’d only recommend starting on one star until you’ve got some extra points to spend. Assuming you only have the 5pts for the True Route’s completion your best option is Elina, the yin yang bonus character. She makes the early going a lot easier with her All Guard Shikigami ability.
With only ten points your best bet is to get Elina and the Monk character. In the final siege against Hara your best bet is to either have Elina throw an all guard out and hope Shouji uses Volley, or try and get a shikigami attack off with her. The monk on the other hand will dominate anyone he attacks without costing anything to replenish. Once you have the points available the best options are the Takeda for obvious reasons, or Dokuganryu for Omachi.
On a side note I just finished Rance VI,not as polished as Sengoku Rance but damn fun nonetheless. It’s also way more satisfying thanks to the fact that it’s game over if you lose against bosses. On top of that the post game bosses are ridiculous (Post game Alberto was a serious pain, more specifically Anisu). Don’t think I’ll ever win the bonus fight against the Giant Golden Honey though, he makes Orochi look like a Squid Man.