I feel like Izu is beating himself up for acting so differently when he's with maise than when he's without her. Obviously, the gap is so big it's basically like a different person but he's not uncomfortable when he acts nice it's just not his first train of thought, and acting like a demon king is normal for him cuz he's you know a demon king. I mean everyone acts differently around different people so I feel like Izu should accept himself a bit.