When rei sings "this love song between a human and a monster" adonis stands behind him and mimes the arms of a monster with claws on "monster" (and kaoru and koga do this super cute show-off move)
The camera angles make it hard to tell, but they do some interesting blocking in general during lines about a monster where one (or more) members will stand behind the other with arms outstretched. i think it's supposed to make the member in front look like they have more than 2 arms
Drum kit on stage has a skull and roses (wow, i wonder who picked that one out)
On the line "[every smile of yours] is like a stake piercing my fickle heart" they mime pulling out something from their heart instead of stabbing something in
more undead character lighting!
koga prom pic hover hand
the heart on the mannequin matches the heart on the jacket! this one's pretty obvious i just really love the way adonis looks in this screenshot
This ending pose is unique in that adonis and koga are in the middle -- usually rei and kaoru (or at the very least rei) take center stage. the exceptions are the event songs, but in these cases the two center positions at the end have always been the 5* and 4* characters. considering that rei is the 4* in this event, not koga, i think it's really sweet that the senpais gave the underclassmen a chance to shine! it feels like undead is on more equal footing in !!!-era ❤️