I'm interested in this event and it took me a moment since all the obvious ships I've wanted to launch.... I've launched for other stuff but I'll aim for one of the below (or maybe a surprise, who knows).

Yu-Gi-Oh! Vrains: Ai/Earth (interestingly, Ai/Earth/Aqua exists, so does a polycule variant with all the Ignis, as well as platonically but not romantically)

Star Twinkle PreCure: Elena/Madoka/Yuni, Hikaru/Lala/Yuni, and (as I already havee a wip of this spicy little morsel) Lala/Lolo

Healin' Good PreCure: Nodoka/Rabirin, Eriko/Hinata

Tropical Rouge PreCure: Masami/Yuriko

But I do have a long, long list of YuGiOh and Pretty Cure femslash and would imagine the vast majority of it would qualify but will double check before picking anything from it if I so decide.

edit: added the ship I've written inklings of here and there as a past/referenced relationship but fits the criteria and ergo makes me really want to write them but I've actually started a Masami/Yuriko fic,,, October is heaps away :3c