In some manga, a boy and girl friendship can hold up. It often depends on how the authors handle the relationship, the common interests or goals of the characters, and the way they support each other through various situations.
Shōnen manga and giri manga were two different types of manga. The main differences lay in the audience, storyline, and style.
Shōnen manga usually told the story of teenagers growing up and exploring the world for young readers. These stories usually had elements of adventure, friendship, love, and often involved supernatural or fantasy elements. Shōnen manga's style was usually rough, the colors were bright, and the characters were exaggerated.
On the other hand, teenage girl manga usually told young female readers the story of girls growing up and exploring the world. These stories usually had elements of romance, friendship, love, and often involved supernatural or fantasy elements. The style of a girl manga was usually more delicate, the colors were softer, and the characters were more elegant.
Other than that, there were also differences in storyline and character settings between Shōnen manga and Shōnen manga. Shōnen manga's storylines were usually more complicated and had more rich character settings, while Shōnen manga's storylines were usually simpler and the character settings were relatively simple.
Well, it could be a result of a wish gone wrong or some supernatural power. Sometimes, it's just a wild imagination of the creator for unique storylines.
Well, it could be a comedy where the transformation leads to hilarious situations. Or it might be a serious drama exploring the character's internal struggle and self-discovery after the change.