Based on this bounty https://civitai.com/bounties/564/hiroya-oku-style-lora
Creator of Gantz and Gigant, very cool style. I believe sometimes uses real life photos for backgrounds. Looks great in color, but exceptional in grayscale.
Include word Manga in your prompts.
I recommend using Dreamshaper 8, but you may be able to discover a checkpoint that works better with it.
Weight should be around 0.7 - 1.