Kami Neko Mii-chan to Neko Youhin Shoukanshi no Isekai Funtouki (Light Novel)

When 18 year-old Neji loses his life after saving Mii, an errant kitten belonging to a goddess, the grateful deity offers to let him continue enjoying the blessing of life in a different world with all the knowledge he currently possesses and powers he didn't have before. Neji, now named Nero, is eager to begin his new adventure in the Kingdom of Lumiel in spite of the dangers he's warned await him; but he soon learns that Mii will be tagging along on his journey - and the new abilities the goddess promised him have been replaced with the power to feed the cat!