Yes, this is actually true (and it would've been more than just a remake). It's briefly touched on in one of the Hanihon magazine issues, but the long and short is that an external company reached out to Alicesoft about a 3DS version of Sengoku Rance. TADA wasn't opposed to this in theory and they entered the planning/discussion stage, but things fell apart quickly as the external company wanted too much creative control over the plot and rewrites, the story quickly started going in a direction Alicesoft wasn't comfortable with so they pulled the plug on it. Surviving accounts go into a little more detail, it was supposed to start the same as Sengoku Rance with Rance uniting Nippon, only to expand into a full Continent conquest game like Kichikuou. It's hard to tell if that's the part Alicesoft had an issue with or not, because most of the accounts are fragmented, but it was definitely real at one point.