Manga by author Narumi Naru - Status ongoing

Ever since his parents died, Watari Naolife has revolved around his little sister. He forgoes club activities for the sake of spending time with her, leading many of his peers to label him a siscon. But as long as his sisterhappy, Nao is willing to shut out any unwelcome comments about himself. Unbeknownst to Nao, however, a greater danger has resurfaced - one that destroyed his way of life six years ago, and threatens to do so once again. And that danger, in the form of a girl wielding a garden hoe, will stop at nothing to reclaim what could once have been hers, and hers alone.

Meet Koizumi, the new speechless transfer student. She loves ramen. A LOT. She will go to all lengths to eat some ramen and there is no such thing as too much. Oosawa Yuu follows closely behind, trying to get close to Koizumi at every opportunity, despite her disapproval.