Yuusha Party ni Kawaii Ko ga Ita no de, Kokuhaku Shite Mita

When Youki was reincarnated into a fantasy world, he did not receive the grand destiny of a chosen hero or the overwhelming authority of a Demon Lord. Instead, his new life began with a distinctly underwhelming twist: he was reborn as a mere minion serving within the Demon Lord's ranks. Despite this seemingly insignificant role, Youki possesses hidden depths that belie his lowly status in the dark hierarchy. His quiet existence is abruptly disrupted when the legendary Hero's Party launches a bold assault on the Demon Lord's castle, determined to vanquish their ultimate enemy once and for all. Yet, the invaders severely underestimate the fortress's defenses. Youki effortlessly repels their advance, brushing aside the heroes' attack with remarkable ease and proving himself far more formidable than anyone anticipated. However, the battle leaves Youki with an entirely unexpected complication. Amidst the chaos of the siege, he locks eyes with Cecilia, the beautiful cleric accompanying the Hero's Party, and falls hopelessly in love at first sight. Now, rather than simply crushing the invading heroes, this overpowered demon minion faces a far more daunting challenge: finding a way to confess his feelings to a girl who came to his home intending to destroy it.