Series: Remilia Attack (966)

Unofficial title, the story is actually untitled
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=52191487
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=52583414

Maricha wants to come along to a hunt but daddy Marisa refuses since she's too young. This causes Maricha to throw a tantrum which attracts a Remilia family