 If you liked
Yakuza Girl: Blade-jikake no Hanayome
|
 ...then you might like
Itokoi Chidori
|
Both female mains are somewhat serious but have thier 'cute' moments.
Both female mains are required to protect a certain someone, that someone being the person they love.
Both manga are fairly short and a quick read.
While Itokoi Chidori is more heavy in the sex scenes, Yakuza Girl is more heavy in gore and violence. Both are plenty heavy in ecchi/nudity.