The Fourth Progenitor—That's the world's strongest vampire that should only exist in legends. Accompanied by twelve Familiars and spreading chaos and mayhem, this phantom vampire appeared in Japan. In order to deal with potential threat, the government and Lion King decided to dispatch a Sword Shaman to keep an eye on him, and kill him if he becomes a threat. However, for some reason, the one chosen for the observation was an apprentice Sword Shaman girl, Himeragi Yukina. Wielding the strongest anti-progenitor spirit spear, Yukina arrived at Demon District, Itogami City. What will she find when she encounters the Fourth Progenitor, Akatsuki Kojou?!Strike the Blood is a Japanese light novel series by Gakuto Mikumo of with illustrations by Manyako. A manga adaptation began serialization in August 2012 in ASCII Media Works's Dengeki Daioh. A 24-episode television anime adaptation by Silver Link and Connect began broadcast as a part of the Fall 2013 Anime season.
Accidental Pervert: Kojou frequently ends up this, especially toward Yukina. Her typical reaction is what you would expect from a Tsundere.
Blood Knight: Christoph Gardos loves the thrill of war so much that he is trying to cause a war just for this reason.
Child Soldier: Lion King's members like Yukina are all orphans who have been recruited from young age and formed to serve as weapons.
Crouching Moron, Hidden Badass: Kojou isn't exactly stupid, but he is rather laid-back, lazy and generally lacking any drive or motivation in his daily life; definitely not what you would expect from one of the most powerful vampires in the setting.
Deus Sex Machina: Toned down; Kojou's Blood Lust apparently activates through sexual arousal, meaning he needs to be aroused to suck blood and can lose control whenever it happens. However, it usually just takes fairly modest fanservice (such as panty or skin exposure from a girl) to get a reaction from him, so no real sex has been involved so far.
Dude, Where's My Respect?: Despite the fact that Kojou is an immortal monster who can literally wipe an entire city off the map with incredible ease, a surprising number of people seem to think it's a good idea to fight him. Justified in that he's still coming into his power, and that he's only able to win most of his fights with help due to inexperience.
Friendly Neighborhood Vampire: Despite being a Person of Mass Destruction and one of the most powerful vampires in the world, Kojou is in no way evil, and satisfies his Blood Lust by drinking his own blood. In fact, when he became the Fourth Progenitor, his first idea of how to use his powers was to try to make the world a better place by focusing on Asshole Victims, but he gave up on it and settled on trying to keep a normal life.
Hates Being Touched: Kirasaka, though only by men. She appears to be able to make an exception with Kojou eventually.
Ignore the Fanservice: For someone so frequently accused of being a pervert, Kojou is hilariously indifferent and oblivious when Asagi actually tries to seduce him.
Kiss of the Vampire: Played with; although still undeniably erotic as per usual with this trope, instead of an invasive rape-metaphor, the scenes in the Anime where Kojou partakes in the blood of his love interests are portrayed as surprisingly tender and heartwarming moments of sincere bond, trust and friendship. The gentle and romantic piano music used in said scenes really helps.
That Came Out Wrong: Sigh... What sweet and innocent little Yukina-chan tried to say to Kojou was "His bite didn't hurt too much, she didn't lose too much blood, it was a safe-day on the astrological cycle and hence the tests for her becoming a vampire came back negative. But paraphrased by Asagi who overheard the exchange, it came out as:
Eh, so you didn't hurt her too much, she lost a little blood, but it was a "safe day" so her "test" came back negative, huh?
The Call Knows Where You Live: Kojou honestly has no specific ambition or goal beyond "being left alone", but people keep coming in his life due to his status and end up bringing him into supernatural situations.
Vegetarian Vampire: Kojou initially, in that he feeds on his own blood rather than drink others. It's the main reason why his familiars don't follow his orders.