At which chapter is this manga ending? My bet is on Mahoro suddenly not being able to see the guys at the apartment. Then it ends with her being able to see them again.
I doubt there's even a scant chance of someone sleeping on the commute also holding the adjacent person's hand. She's clearly okay with stopping being an idol, and clearly wants MC to initiate it. MC just needs to stop being a spineless sap.
DHA might make sense, considering the fishes in the background. Fishes and other seafood are typically sources of DHA. I'm just not sure how it's connected to voluptuous tiddies.