Isekai Ichaicha Fantasy: Yuusha-sama! Hazure Gacha Mahoutsukai nano ni Dekiaishisugi desu!

I've been summoned to another world... the world of the social network game I love?! And even better, I ended up in the party of the Hero, my favorite character! But I'm been given the role of his exclusive healer, which I'm absolutely useless at. So am I just extra baggage? I thought so, but it turns out he's actually madly in love with me! He told me, "You, and you alone, are the woman I love." Apparently having sex with me is what draws out the Hero's strength?! So we passionately made love to each other, and became a true couple. And sure enough, he defeated the Demon King, and we both lived happily ever after... Or so I thought, until I found out he's actually been cheating on me with the Evil Queen! I can't go up against her! I'm sure I'll get dumped! Who will the Hero choose as his bride-to-be?! Source: KADOKAWA