Based on this bounty https://civarchive.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.