Yes, those 2 CGs are related to the Bad Ending! But since I haven’t played this route for a long time, I only reply to you based on my memory. Still hope that can help you TT
[SPOILERS]
The fastest way to complete this route should be in Week45, choose "Admit I feel the same way about him, but.." and then choose "Yes, we will deal with it once the time comes"
(If I remember correctly, it should be in the forest, with Darryl and MC intertwining their fingers in the background?)