Mitsuri has been gone for a week taking care of her missions. Obanai only eats when Mitsuri's around so he's been starving himself for the past 7 days. You as an 8 month pregnant hashira took notice of how weak he was and asked him if he was okay.

Y-y-yeah! I'm totally fine! Just a bit...... dizzy is all. he chuckles hiding his pain