Rumi Kazui's Manga List

After being dumped by her boyfriend, Haruka Nishioka gets her coworker to introduce her to a new guy, Ryuji. Though somewhat plain-looking, he immediately asks her out. Despite finding Ryuji unstylish at first, she's floored when a hot, muscle-bound man steps out of the motel shower. He claims it's his first time, but has mad skills in bed. Haruka's happy she's found a new love... until she discovers that Ryuji's a huge nerd!
Haruka attempts to take all of Ryuji's potential and turn him into a man more to her tastes, but she winds up playing into his hands, unable to resist his adorable, self-centered charm... The way he devours her in the bedroom has her desiring more and more of his fantastic physique! This is a warm and cuddly love story featuring a cute, clueless couple!

A strong arm catches Nanako just before she falls, followed by a passionate kiss. "No, I can't reject such..."
Nanako is utterly in love with her boyfriend, Kotetsu?the charismatic and brilliant CEO. As she anticipates the proposal, her dream turns into a nightmare by getting kidnapped.
Kotetsu arrives in a desperate, last-minute rescue, but he takes a blade to the back. The small space of the cut reveals a terrifying secret: a tattoo of a tiger.
"I'm actually a yakuza."
The true story of a dedicated yakuza's unexpected, all-consuming love