Wanko ni Kuchizuke
Why not be my dog

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Some extremely similar artists here, both in taste and style. Youko is definitely longer and more serious, while Wanko is a more concentrated burst, but both have a similar flavor of supernatural battle stuff combined with an absolutely delightful cast that mesh well both in power and personality. I'd say Sengoku Youko definitely does more, but that's more of an issue of length than quality - it's admittedly far outpaced in the romance category. The authors have similar senses of humor and similar talent for creating fun but high-stakes worlds that always feel genuinely lived in. 

Lewd-comedy manga about ghost-hunting as an office job in urban Japan. 

Both follow a "monster of the week" format and involve a couple battling where one must activate the other's powers. While I'm not sure how to say more without spoiling things, the development of the main relationships hit similar notes at times.