Magu-chan: God of Destruction Series by Kei Kamiki

Ruru Miyanagi is an ordinary girl who lives in an ordinary, boring, rural town by the sea. One day, while digging for clams, she finds a beautiful gemstone buried in the sand. Her hopes of cashing in the gemstone are thwarted when she notices a tiny crack in it. But when she tries to fix the crack herself, the gemstone breaks, and Mag Menuek, the god of destruction, appears in its place... moreRuru Miyanagi is an ordinary girl who lives in an ordinary, boring, rural town by the sea. One day, while digging for clams, she finds a beautiful gemstone buried in the sand. Her hopes of cashing in the gemstone are thwarted when she notices a tiny crack in it. But when she tries to fix the crack herself, the gemstone breaks, and Mag Menuek, the god of destruction, appears in its place. Thus begins Ruru’s new life of living with an immortal, somewhat-adorable God of Chaos hell-bent on taking over the world! less

Ruru’s life was turned upside-down when the god of destruction Mag Menuek started living with her. Now she’s got her hands full with the god of madness Naputaaku and the Holy Knight Izuma both set on defeating Magu-chan. And to make matters worse, Magu-chan isn’t one to sit around and wait for trouble to come to him. Instead, he decides he needs to expand his domain and visit Ruru’s school!

With each passing day, Magu-chan’s domain of influence slowly but surely expands. At first, he may have only had one simple girl for a follower, but now he has a whopping…four students! However, with Naputaaku and now Uneras in the mix, Magu-chan’s got a bit of competition when it comes to gods in the neighborhood. That is, until Magu-chan comes down with a cold! Who even knew gods could catch colds?! Will Ruru and the gang be able to cure Magu-chan of this plague?!

無事お母さんと再会できた流々。一緒にすごしたお正月も過ぎ、節分･バレンタインとイベント盛り沢山！　イズマも転入してきて流々の学校生活はいっそう活気づくなか、マグちゃんの新たな同胞が現れて学校は大騒ぎに!?

新学期を迎え三年生になった流々たち。クラスにはなぜか学生服姿のマグちゃんとウーネラスも…!?　別の日には、荷物検査でマグちゃんが先生に見つかってしまい!?　混沌と波乱の新学期編がゆるっとスタート!!

秘密基地を作ったり、ゲームしたり勉強したりと、日々支配を拡大している破壊神マグちゃん。流々と出会って一年を迎える頃、マグちゃんを狙う『運命』の邪神・ミュスカーが本格的に暗躍し始めるが…!?

流々たちは邪神のいる夏を堪能。部室で怪談話や、錬の家族の海の家に手伝いに行って、海を満喫したり！　だがミュスカーの乱入でマグちゃんたちが無人島へ漂着!?　果たして流々は邪神たちと再会出来るのか!?