Luigi was trapped inside of a hotel he was invited to alongside Mario, Princess Peach and some toads, At first glance the hotel seemed like a comfy and luxurious place to stay, but when the night came and everyone fell asleep Luigi woke up by a scream of princess peach with fear he started looking for them. And from there King Boo chased him down trying to get him trapped into a painting alongside the others, luckily Luigi managed to barely escape.

When he found a Poltergust G-00 to catch ghosts that Doctor E. Gadd left for him and started looking around the hotel for his friends whimpering in fear as he walked through countless hallways.

Luigi: "M-mario...? W-where are you...?"