Pretty interesting vintage manga, though as much so as a historical source as it is for its own virtues.
Has a bunch of bare boobies fanservice (in some chapters, censored out by TRANSLATORS of all things) and tons of gore, presumably hence the "seinen" classification... but a very wimpy classical shounen MC, whose lack of resolve to kill or fight cheap is super-jarring, and due to which he tolerates and enables an impossible-to-believe quantity of collateral damage and unnecessary death
ESPECIALLY since, due to the main villains' absolute agenda throughout most of the series, a simple threat of the MC & heroine committing double suicide would thoroughly disarm and stalemate the big bad, stopping most encounters in their tracks, while actually following through with it would corner them entirely