When I first saw this comic I was thinking that it would have made more sense for Bae to be the one to grab Sana's hand since she's generally a much more wholesome person than Mumei. Now I've come to the realization that Sana brings out the best in people. Normally Mumei and Kronii aren't exactly what you would call sweet, but when it involves Sana they become much more affectionate because Sana is sweet to everyone, and they feel the need to be sweet right back to her.