Yuutsuu no asa, ze-kami no hon, dark heaven
Hidoku shinaide, "yume musubi, koi musube " , omaeri desu yo, elektel delusion, hinekure chaser... these are not like finder and sex pistol.. ish.. but they're long and suuupppeerrr goood try them you won't regret it
read them all except hidoku shinaide, its still on to be read list!
It's the best one though lol and omaeri desu yo too
I'll recommend: "Acid Town", "Animal X", "Totally Captivated" and "Crimson Spell".
Links: http://www.mangago.zone/read-manga/acid_town/
http://www.mangago.zone/read-manga/animal_x/
http://www.mangago.zone/read-manga/totally_captivated/
http://www.mangago.zone/read-manga/crimson_spell/
All of them are longer series but if anything Animal X is my favorite, though this may be the furthest in similarity to your request.
Any long mangas with good stories like finder, haru wo daieta ita, sex pistols, etc.