What is this manga with a lion on its cover?
This is volume 1 of「ヤスミーン」(Yasumiin), written as "Jasmin" in English letters, authored by the mangaka Hatake Yui (畑 優以). It is published by Shuueisha (株式会社集英社) under its Young Jump Comics (ヤングジャンプコミックス) line.

It is available to read for free online as an e-book on Shuueisha's official website.