4+ generation, active, air, air force, and, art, as the, attack, being, book, bridge, bsa m20, chaos, characters, coat, conditions, counter, cross, cyrus, database, death note, demon, design bureau, destroyed, destruction, developer, domination, dragon, dry, enemy ., exploration, fall, fiction, fighter, fire, force, ghost, giant, ground, gun, helicopters, in the air, intelligence, intended, katana, last seraphim, light, live, lock, magic, mane, men, mi- 28, motorcycle, multi-purpose, muscles, night hunter, other, owari no seraph, part, plane, purposes, racing, rider, river, robots, russia, russia ., ryuzaki, scout, search, seraph of the end, ship, shock, skeleton, sky, soviet, steampunk, stones, su - 30, su-27, su-30, surface, tanks, the kremlin, the old, town, vehicles, war, weapon, winter, ww2., yagami, yuuichirou hyakuya