What are the possible reasons for a guy to stay jobless in manga?

One reason could be better preparation. Just like in a test or a competition, if the girl has studied or practiced more, she can beat the guy. For example, if it's a spelling bee, the girl might have spent more time memorizing words.

Magic could be a reason. Like in a fairy - tale world, a spell cast by a wizard or a magical object might cause the transformation.

The most common reason is the way she dresses. If a girl wears masculine - style clothes like baggy pants, oversized shirts and has short hair, she can be easily mistaken for a guy.

Maybe he got injured in some adventure or accident. Or it could be a part of his character design to make him stand out.

One reason could be that he was simply born with the potential for same - sex attraction but due to social conditioning and the environment he grew up in, he initially identified as straight. As he grows older and more self - aware, he starts to recognize his true feelings.

Maybe he was really tired from working or studying hard. That's a common reason for dozing off at an odd place.

Maybe he ate too much candy or didn't brush his teeth properly.

Well, perhaps there's a power struggle in the mythological world. Some powerful being wants to control or manipulate Percy, and they see Artemis as a means to an end. By forcing Percy to stay with her, they can keep an eye on him or use Artemis's power and influence to their advantage. It could also be that Percy has unknowingly stumbled upon a secret or a power that is related to Artemis, and to protect it or study it further, he is made to stay with her.

His personality. Maybe he is really funny and makes her laugh all the time.

It's got a great story and interesting characters. The world-building is amazing and keeps you hooked.