Rina and holes (Rina and Ana)

It can be said that "legendary studio" IvoryTower (FuwaKumi, MixPeace, Nana's daily work) returns after 5 years of silence in 2018 with a new work "Rina and Ana".  The main heroine of the hentai is a girl named Rina-chan who was playing on the playground late in the evening and, while trying to save her phone, got stuck in one of the holes. Then out of nowhere a lecherous guy appeared and took advantage of the situation...