Hi guys
I'm searching for a manga/manwha involving gender swaping,no crossdressing or anything,the MC just has to have his gender changed (willingly or not)

If possible,in a school-life environment

Thanks in advance

Kanojo ni Naru hi
Kanojo ni Naru hi Another
Fukigen Cinderella

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Off the top of my head:
Yamada-kun to 7-nin no Majo
Orange Chocolate
Kanojo ni Naru Hi and Kanojo ni Naru Hi Another?
Gyakuten Honey
Ame Nochi Hare (Bikke)

Also, there's a category tag "Gender Swap". I don't know how comprehensive it is, but it's probably worth looking through. You can find more with tags like "Body Swap/s" with the genre gender bender.

I only watched the anime of it, but Kashimashi - Girl Meets Girl is definitely this. Highschool setting. Male MC who is turned female at the start of the story.

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Thanks guy,will read everything tonight

Boku wa Mari no Naka
Give it a try, thou is not the typical ecchi, comedy, romance. Pretty serious manga.

Cheeky Angel The art seems a bit weird at first, but its a pretty good manga
Kakumei no Hi is pretty good too, though its kinda short
Sekainohate de Aimashou was good too
Ichinensei ni Nacchattara he gets turned into a 1st grader so yeah .... but still