Games like DS Dengeki Bunko: Iriya no Sora, UFO no Natsu II

If you finished DS Dengeki Bunko: Iriya no Sora, UFO no Natsu II, the closest matches are Steins;Gate: Linear Bounded Phenogram, Clannad, Muv-Luv Photonflowers*, Code Geass: Lelouch of the Rebellion - Lost Colors and Little Anchor. All 6 share its visual novel genre and are ranked by how closely their themes and modes overlap.