Second only to Duodecim, this game is one of the best examples of fanservice for a long running franchise I've ever seen. I poured over 100 hours into it back in the day, and with good reason. The story mode is so robust, and it has great moments between characters that feel way more natural than they should.

Can't recommend it over the sequel though, since the entire original plot and cast are in Duodecim as well.