Games like Hira Hira Hihiru

If you finished Hira Hira Hihiru, the closest matches are Milk Outside a Bag of Milk Outside a Bag of Milk, Tsuki ni Yorisou Otome no Sahou, I Walk Among Zombies Vol. 0, Clearworld and Muv-Luv Photonmelodies. All 8 share its adventure genre and are ranked by how closely their themes and modes overlap.