Tactics game for Windows by Falcom. There's an English version available to download for free from their website.

• https://www.falcom.co.jp/vantage/index_e.html

This Youtube playlist acts as a good guide, ghough they also have a manual on their download page.

• PLGVwn-h3E3CMvNJYSFjivfOj7WBEFREaQ