I keep re-reading cause theres no new chapters Ch. 18 THE RINGGGGGG NOOOOOOO WHO WOULD'VE THOUGHT THAT THAT WAS THE PRIZE FOR THE STAMP RALLYYYYY Ch. 20 Yayyy!! The heroine has appeared!! Now grant MC's wish to go home.
Isekai Tensei, Ore ga Otome ge de Kyuuseishu