Product: Why Shouldn’t a Detestable Demon Lord Fall in Love?! Vol. 3 (light novel)
After his audience with the king, Anima and his family return to their quiet life on the outskirts of Garaat. Slowly but surely, Anima grows closer to Bram, the newest addition to their little family, as the five of them prepare for Marie’s birthday and take part in the wonderful Costume Festival that only comes around once a year! 
Between these exhilarating events, Anima and Luina get the chance to spend some quiet time together on their very first date. However, the sweet memories of their date are in danger of turning sour, as Luina collapses not long afterward. Anima has no choice but to unleash the full extent of his power to blast off in search of help before it’s too late. 
Follow the strongest Demon Lord and his beloved family as they discover that the best gifts are the ones money can’t buy!

Search query: not
Relevance: Substitute