In two words, Ikki Tousen is a visual blowjob. Targeting the teenage boy niche audience, it has everything a typical adrenaline-driven guy would find interesting in any anime show: School girls, panty shots, pointless fistfights, and subtle hints of sex, and then more panty shots. Yeah, panty shots cover up around 30% of the animation budget for this show.
There is very little of anything else, like, oh I dont know, CRITICAL PLOT SCENES. If there's nobody getting naked, showing panties or breasts, or fighting, or getting naked while fighting in their panties, it's just the opening and ending credits.
I am not exaggerating when I say I've seen porn with better plot than this show.