Hello, i'm looking for a manga that basically has a good story and romance. The romance doesn't have to be the fore-front, a good story is what i'm looking for after all. Meaning a well thought out and solid plot - no stupid decisions by the protagonist, major plot holes or unnecessary plot dragging. Everything doesn't have to be given to the MC - he can fight for it or loose stuff he cares about. I don't want a harem ending and preferably the protagonist would be interested and pursue only one girl (no yuri or BL). Marrying and early romance are a big plus - there's no need I think for everything to happen right at the end. I'd prefer no ambiguous ending. I dislike airhead, wimpy protagonists and characters that think all they need is the power of friendship to win - if they are gonna be like that they better have some meaningful growth(but still I rarely see this done well, so somebody competent would be better). Over the top tsundere are also kinda lame. Mature themes are fine - like violence, swears, horror etc. The novel has to either be finished, close to being finished or being translated regularly. I'm mostly interested in japanese stuff since I haven't read anything chinese or korean but if you think it's worth giving it a shot feel free to suggest it. Overall something a little more serious and mature is what i'm looking for.Thank you.

A little about what I've enjoyed reading (going to include non-manga's for more samples):
Gekkou,
Gantz,
Grisaia no Kajitsu,
Tokyo ghoul,
Steins;gate

Sugar Dark - Umerareta Yami to Shoujo
Kiseijuu
Hoshi no Samidare
Ares
World Embryo
Shi ga Futari o Wakatsu Made
Full Metal Panic! and Full Metal Panic! Σ

~4400 manga completed
~1700 ongoing...