「勇者」パーティに潜入した魔王軍の暗殺者～危険度SSSクラスのミッション、バレない様に頑張ってたら女勇者に気に入られた～

The Demon Lord’s Assassin in the Hero’s Party – An SSS-Rank Mission to Stay Hidden, but the Female Hero Took a Liking to Me, The Demon Lord’s Assassin Infiltrates the Hero’s Party An SSS-Class Dangerous Mission, but While Trying Not to Get Caught, the Female Hero Took a Liking to Me; "YUUSHA" PARTY NI SENNYUU SHITA MAOU-GUN NO ASASHIN: KIKENDO SSS KURASU NO MISSION, BARENAI YO NI GANBATTETARA ONNA YUUSHA NI KINIIRARETA