Title: 2人は融合素材

黒き森のウィッチとハイプリーテスを融合して、音楽家の帝王になるのかぁ・・・、きっと魔理沙ちゃんと聖さんで代用できるよね？どうでもいいけど、二枚のカードはどちらも女性のモンスターなんだけど、融合後は男性のモンスターになるんだよ。不思議だね。

I get the feeling this is attached to the same storyline as the collared Remilia and the cosplaying Marisa.

They are the fusion material.

I wonder if I can combine the witch of the black forest and the high pritestess to get a lead musician....
Surely Marisa-chan can be replaced by Hijiri-san?
It doesn't matter after fusing the two spell cards, you can get a male monster.
How mysterious.

So it's a Yu-gi-oh reference. You can Fusion Summon the monster "Lead Musician" by sacrificing the "Witch of the Black Forest" and "High Priestess" monsters as Fusion material. Wait, does this mean if you kill Marisa you get to search your deck for a monster with 1500 DEF or less and bring it to your hand?