Omori was in headspace, Sunny's imagination, as usual, he was bored and lonely, he didn't want to be in headspace anymore, he didn't want to see his friends, he was sick of it, looking around Omori saw his cat, Mewo, a tissue box, his sketchbook, his knife, and finally his laptop, he grabbed his knife, holding it tightly he then carved a decent sized hole in which he crawls through, he looked around and realized he escaped a piano, exploring the new area, he realized was in a locked room

(Edit: thank you guys, you're so wonderful!!)