If you're looking for manga similar to Madly in Love with My Not-So-Gay Best Friend, you might like these titles.
Ayumi led a peaceful life as an office lady for the cosmetics company, Ashikawa Business. But, after an extremely scary head chief was transferred over from the main branch, her life has been very distressing. However, she accidentally fell in love with the head chief, and they are secretly going out together...
Natsu Yoshizawa finds herself abruptly transferred to product development at the bedding manufacturer where she works, and then given a coveted spot on the team designing a bed aimed at newlyweds. Spearheading the project is Moriba, a man from Natsu's hiring group who's since become a powerhouse at the company, and almost as soon as she arrives he proposes to her out of the blue...!! Well, not exactly. It turns out he just wanted to "play house," temporarily pretending to be a married couple, in order to better understand their target customers' mindset. Natsu reluctantly accepts, since after all it's just research for work, but when Moriba proceeds to treat her just like an actual wife she starts wondering if she's in over her head. He even puts on a morning pillow-talk act, whispering about how adorable she was last night as if something had actually happened between them...?! Now, hold on just a second! This really isn't what it looks like...! (Not yet, anyway.)
Ayumu was secretly dating her superior at her company until he broke up with her. Though deeply hurt, she could not outwardly express it. Not long after, she began living with her well-liked co-worker, Yachi, at her grandfather's house. While living with the friendly Yachi-kun, Ayumu starts to change..
"Why do I have to be the one to 'put it in'?"Shun Mizuo has always got a smile on his face. He's popular amongst his coworkers and he's good at his job... but he's useless in the bedroom. One day, heartbroken after discovering his girlfriend cheating on him, he drinks himself into a stupor and reveals his "situation down there" to Amachi, his beautiful-yet-frosty coworker. What happens when, suddenly, Amachi says that she feels that this moment with Mizuo must be fate?! An office romance between two people both hopeless in the bedroom!
With her stern efficiency, Nao Yoshinaga is known as the Ice Iron Lady of the company. One day, she overheard colleagues making a bet with Satomura that he could make Nao fall for him. Unbeknownst to them, Nao has had a secret crush on Satomura for all this time. The bet could turn out to be her best chance!
Nanami Uchida has been dumped by her boyfriend and decides to go to a work party, where she drinks a lot. Her colleague Sakuma invites her to continue the evening in another bar alone with him. He takes the opportunity to ask her to be his girlfriend. Under the influence of alcohol, Nanami accepts. The reason Sakuma wants a girlfriend is... that women give him too much of a head start and he thinks it's boring! How will this fake couple evolve?
"I want to get married and quit this job!" That's why Airi evaluates all the male employees everyday. "Definitely not this guy!" is what she thinks of the working demon, the president's secretary, Misara, yet she has caught his attention...?
"Did you know? Even I get a turn to make my move." Temp worker Rino Amano, 27 years old, used to have a lover. His name was Haruo Higashiyama and he worked full-time at the same company as the manager of the planning department. He was 32 years old, married, and had a two-year-old daughter. While 99% of her knew that this was an unforgivable love that would never amount to anything, the other 1% was clutching her phone, spending her days waiting for him to reach out. One day he suddenly demands to break it off, throwing the feelings she had for him in the trash. This devastating blow leaves Rino distraught. Even at work she is unable to suppress her feelings, and she searches for an empty room to hide her tears. In doing so she catches Haruo secretly making out with another coworker much younger than herself. At that moment something inside her breaks and awakens something inside.
Nanami Arakawa is the chief secretary to the CEO of a general trading company. Her boss is a quick-tempered man who's all about his work, and is feared by his employees. But he's handsome. The guy her coworker introduces her to is a cheerful guy who's extremely laid-back. But he's handsome. Will one of these guys become Nanami's first love? An exciting romantic comedy following a professional, yet awkward secretary's attempt to discover love that will keep you on your toes!