The device for mission 2 is located in Sector 1, just to the right of Minami's house. To activate it, you first need to have the dialogue with Kazumi, and during the nighttime collection mini-game, unlock it with 10 Lewd Points. I'm currently reworking large parts of the game, which includes fixing issues related to explaining how to complete the missions. I hope to improve that in the next update. Cheers!