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Ngao is supernatural/horror and Cheewit Puer is action/romance, but both have an ultra "pure"/innocent FL who acts as a purifying influence on the ML and all around her, have cheerful, bright personalities, and really are the ultimate force in setting the ML on a more righteous life path.
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Appreciate that host club dance in 3 Will Be Free? You'll get more in Llong Ruk. In Llong Ruk a romance started in a host club is the center of the story, but it's not the central theme in 3 Will Be Free, though both have infidelity themes as well.
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Both deal with romances with an older woman and a younger host-type guy, and both have infidelity themes and existing relationship troubles.
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If you want to go completely down the "super sexy writer woos an innocent" path, you have to check out Pornographer. These two dramas share a lot of the same vibes but Pornographer is a lot more mature.
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Bungaku Shojo has the same heavy chemistry, but doesn't move quite as fast. The FL is a functioning professional and not as empty-headed as the FL in Coffee & Vanilla. Bungake Shojo also doesn't suffer from so many unnecessary plot developments toward the end.
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These are both "inexperienced romance writer/editor//mangaka finds love" dramas. Both short and fluffy and don't take up too much time or brain cells.
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Both of these involve infidelity, betrayal and revenge. Both have characters that are getting close to the leads under false pretenses, and are relatively mature in content.
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If you want to see another social commentary regarding gender roles and marriage in Japanese society, Nigeru wa Haji da ga Yaku ni Tatsu handles it very well, is a lot lighter with no controversial elements, and really dives deep on the concepts of housework and valued work in society/relationships. Kareshi wo Loan is considered more controversial and definitely has some darker elements.
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I'm surprised this recommendation hasn't been made yet. Both involve a FL in a master/slave power dynamic with degradation themes where the woman holds the power (in theory). In Kono Otoko was Jinsei the ML is willing - in Kareshi wo Loan, the dynamic is a forced debt situation and the drama is considered pretty controversial/outrageous.
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Both have girl squads bonding over drinks etc, except Sexy Central covers their stories more evenly and Fabulous 30 is centered more around the FL.
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Similar feels of professional women trying to win at love and their careers, and sharing their joys/pain over drinks or dinner. Tokyo Tarareba is a bit more silly with comedic elements and is more focused on finding "the one".
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Both have the girl squad feeling that explores ups/downs, betrayals, affairs, and bonding with friends over a drink. The drinks are heavier and wilder in Sexy Central, and the affairs are more central in Fukigen na Kajitsu.