Like many other older 3DS retail games, Konami has made New Love Plus available on the 3DS eShop. But you’ll need a bunch of space on an SD card in order to download the game.
1.8GB (14,400 blocks) are required on a card. You can throw in another 600MB (4,800 blocks) for save data. New Love Plus can be purchased for 4,800 yen.