Games like Koibito no Nazo: Lover's Enigma

If you finished Koibito no Nazo: Lover's Enigma, the closest matches are Schrödinger's Call, The Coffin of Andy and Leyley, Sucker for Love: First Date, I Was a Teenage Exocolonist and Milk Outside a Bag of Milk Outside a Bag of Milk. All 10 share its adventure genre and are ranked by how closely their themes and modes overlap.