Starting with a Kiss, Vol. 3 by Youka Nitta
Toru, the son of a yakuza boss, is sent into exile on a deserted island for his own protection during a gang feud. Fiery and impetuous, he isn't thrilled to be sidelined when he'd rather be in the fight, and is even less thrilled that Mutsumi, son of the gang's second in command, is going with him. The serious, studious Mutsumi is Toru's opposite in every way, and it doesn't take long before the sparks between them begin to fly!
After learning that Mutsumi has been taken by the Hokusai Gang, Tohru rushes to the wrong location to free him. Tohru is known for his beauty, and the thugs guarding the Hokusai office are quick to notice. Not wanting to rely on his father’s name, Tohru doesn’t reveal who he is, and with nothing to stop them, the lusty thugs quickly descend on him. When Mutsumi finally arrives to find Tohru nearly defiled, he flies into a rage and pulls out a gun! But how far will he go to save the man he loves?