Learning new skills from a legendary guardian, Mamoru's training is interrupted when a monstrous tengu slithers out of the dark to attack the shrine!

Training under the legendary Renjirô Uzura, Mamoru is deepening his skills as a monster hunter when a fearsome Tengu attacks the shrine! The master and pupil leap to the defence of Mamoru's younger siblings, but the beast is fearsome and begins to acquire power beyond imagining.

Will Mamoru be able to defeat the beast to protect his siblings, or will they have to take up the sword and learn his skills?