 If you liked
Complex Age
|
 ...then you might like
Wotaku ni Koi wa Muzukashii
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Both of these feature main characters who are working adults with otaku hobbies (Complex Age is specifically focused on cosplayers) but are trying to conceal this from their coworkers out of fear of being rejected. They also both have romance/dating in the storyline, although it plays a more minor role in the storyline of Complex Age, and Complex Age isn't as lighthearted.