Cold Steel IV has a lot of issues in its narrative, maybe more than any other trails game, but it's also a big celebration of the entire series and sticks the landing in many important points to finally conclude the Erebonia arc and in some ways set the stage for what's to come.
Having the largest playable roster in any trails game this far while improving the already great CSIII combat mechanics makes for the most fun entry I've played. Coupled with the amazing side content it offers (some of the best quests in the franchise, huge amount of very interesting NPC dialogue) as well as the best parts of its story it became my favorite Cold Steel game and a fitting finale for an arc riddled with issues but full of interesting ideas and great moments.