If you're looking for anime similar to Close the Last Door!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Misaki Takahashi has little hope of getting into a university, so his older brother Takahiro's friend, Usami Akihiko, offers to tutor Misaki as a favor to Takahiro - for Usami is secretly in love with him. However, as time passes Misaki realizes that he has uncomfortable and budding feelings for Usami. Meanwhile, Hiroki is a man who can't get over an unrequited love with Usami in the past - and with the help of Nowaki, he may finally learn to love again. These couples and more experience the joys and sadness of love between men under the most unlikely conditions.
Close the Last Door and Junjou Romantica tread the same ground: both are romantic yaoi pieces that play the seme/uke dynamics for all they are worth. Comedy abounds as rocky relationships and love triangles take over the plot. Fans of one are extremely likely to enjoy the other.
Junjou Romantica has very similar kinds of stories (involving three couples) and even animation style, but is just longer and has far more effective comedy. If you really enjoyed Close the Last Door, then Junjou Romantica will no doubt please you even more.
If man love is your thing, and you prefer something a little more realistic and emotional, then Junjou and CtLD should definitely be on your want to watch list. Both highly romantic, and a little more graphic than some other shounen-ai, these shows will appeal to the wider fangirl audience. If you loved one, you will definitely love the other.
They both have very enjoyable storylines. Junjou Romantica I believe handles it much better, but they are both a good watch.
Ogata is a young man with a recurring dream: he confesses his love to his friend Takasugi, but Takasugi returns the sentiment with a pushy amount of aggression; this terrifies Ogata, who does not want to be the submissive in the relationship. After discussing the dream with his friend Shikibu, Ogata decides to confess anyways - and his dream comes true! The two must now enter a comical dance of seduction in which they put their relationship roles, and attitudes, at stake...
Seikimatsu Darling and Close the Last Door are a perfect match. Fluffy yaoi comedy and some rather rocky relationships form the theme for both titles. The setting in a working environment is also the same and there are plenty of jokes that will appeal to the yaoi fan as they mock the genre in a very light hearted way.
As the only son of a yakuza boss, Ranmaru Oumi is set to marry his childhood friend Kaoru in an effort to unite their families - but he's not happy about it! When a wedding night spat sends Ranmaru to the cruise ship's bar, he meets Alberto "Al" Valentino, an Italian man with a love of all things Japanese. Between Kaoru's bossiness, fights with a rival gang, and Al's unexpected advances, Ranmaru is sure to have a honeymoon to remember!