I absolutely adore dark romance comedy anime, and one that stands out is 'The Devil is a Part-Timer!'. It's a fantastic blend of dark fantasy elements with hilarious situational comedy and a subtle romance subplot. The premise of the Devil King working at a fast-food joint in modern Tokyo is absurdly funny, but the show also has these surprisingly tender moments, especially between the Devil King and the heroine. The way it balances dark themes with lighthearted humor is masterful. Another great one is 'Kaguya-sama: Love is War', which isn't dark in the traditional sense but has this intense psychological warfare aspect that gives it a delicious edge. The characters' schemes to make each other confess are both hilarious and kind of terrifying in their complexity. For something with more supernatural darkness, 'Ancient Magus' Bride' offers a beautiful yet eerie romance with plenty of comedic relief moments.