It's a port of Kirikiri which is a rather popular engine for visual novels in Japan. There's about a 1/2 chance any given VN is implemented on Kirikiri - this allows to run a sizeable chunk of them on the switch (with some compatibility hacks applied, depending on the game.)

Version 1.1.0 of Kirikiri for Nintendo Switch / ニンテンドースイッチ用の吉里吉里
Changes in this version:

  • Higher quality icon
  • Font system from krkrz dev_multi_platform branch is implemented
  • Incorrect event conversion is fixed

https://github.com/uyjulian/krkrs/releases

via http://wololo.net/2020/04/13/psvita-...er-which-lets/