Create a minimalist logo for the digital agency 'Kotobushi Digital' without any text. The design must be in black and dark blue colors and inspired by traditional Japanese family crests, focusing on the crests of Hawk Feathers and the Katabami clover. The logo should combine geometric shapes that evoke the elegance of these crests, with elements that subtly represent a cat and a samurai. The lines must be thin and precise, creating a balanced and recognizable symbol. The design should convey the harmony of strength and grace, reflecting the agency's modern, technological focus, including its work with AI influencers.