Might be woooshing here, but it's the game he stopped doing for the original Kunoichi Botan. He was doing Liebe-chan, took a break from it to do a "small" game which in turn turned into his next big game instead (Kunoichi Botan), then he never came back to it. Me and at least some others were afraid the same thing happened again with Kunoichi Botan 2 when he started working on yet another small game as a break from it... luckily, he obviously did go back to KB2 after finishing Sol Rui After Mini.