Apparently it's Ouji?
From The Lost Media Wiki
Multiple sources seem to point to the title being Ouji Binbin Monogatari, and not Oji Binbin Monogatari. https://monochromeeffect.org/JVCC/2019/08/03/ouji-binbin-no-monogatari/ https://www.gamespot.com/ouji-bin-bin-monogatari-sorekara-hakusho/images/ http://msx.dothome.co.kr/playgame/71/ouji_bin_bin_monogatari__sorekara_hakusho/