#i feel this may be confusing because i keep switching between card/event/gacha set names so i apologise

[project-sekai-facts]

The cards from the Where is ♡? set contain multiple references to previous Mafuyu event card sets. By far the most obvious reference is the mask that originally appeared as part of her Masquerade Doll costume / Captive Masquerade trained 4* card (right). The mask reappears in Mafuyu's My True Feelings card (left), although it has now been broken in half, alluding to her dropping her metaphorical mask in front of her mother.

Another obvious similarity is the strings in both cards. Mafuyu's Captive Masquerade card originates from her first event, Captive Marionette, in which she subconsciously associates herself with a marionette doll she sees in an exhibit, causing her to have a panic attack. She sees herself in the marionette doll because of how her mother treats her like a puppet - every aspect of her life is controlled by her mother pulling the strings. Her My True Feelings card originates from the Saying Goodbye to My Masked Self event, in which she finally stands up to her mother and ultimately runs away, hence why she is shown cutting the strings in the art.

While hard to tell, it seems as though the background in the My True Feelings card may be based on or even be the same location as the cards from the Ball of the Marionettes set. It's easiest to tell by comparing the background to the windows and pillars from Miku's trained Severed Threads 4* card.

Kanade's trained Embracing Your Trembling Back With Kindness 4* card features ivy covering most of the objects in the card, including the strings. This appears to be a reference to the cards from the Nursing my ES set, the set from Mafuyu's previous unit event, Guiding a Lost Child to What Lies Beyond. In this event, the N25 story began to focus on Mrs Asahina's influence over Mafuyu's life, and the ivy growing over everything may be representative of this. There appears to be some ivy on the objects in Mafuyu's My True Feelings card, but it is hard to tell for certain because the background is out of focus.

Kanade, Ena and Mizuki's cards from the Where is ♡? set feature a crystal heart-shaped apple object. This is a reference to the cards from the Snow White in Oblivion set, which featured a smaller version of this item as a charm on all the costumes. Mafuyu's card from this set is also notable for featuring the first physical appearance of Mrs. Asahina (albeit with her face obscured on both the trained and untrained version of the card). The event this set originates from, Mirage of Lights, was referenced in Saying Goodbye to My Masked Self.

Finally, all of the cards from the Where is ♡? set feature furniture scattered around. This was also a common feature in the Ball of the Marionettes set. While the items of furniture in the latter set are rather generic fancy chairs and such, the objects in the Where is ♡? set appear to be mainly household items and pretty standard furniture, likely alluding to how Mafuyu feels trapped and overwhelmed by her home life.