Tsujimura is an award-winning novelist, she is best known for her mystery and children novels. She studied at Chiba University and won the Naoki Prize in 2012 for Kagi no nai Yume wo Miru (I Saw a Dream Without a Key), and in 2018 she won the Japan Booksellers' Award for her novel Kagami no Kojo (Lonely Castle in the Mirror).
It's usually hard to find Japanese contemporary literature I actually like, but the first part of スロウハイツの神様 has been perfectly enjoyable. Simple and easy to read, Tsujimura has the ability to make everyday occurrences appear magic and fantasy-esque. The concept did start to get a little old towards the end though.
Also love the cover art, it matches well with the overall atmosphere.