Okami Wa Nemuranai - Chapter 9.6-7-8-

"Locke transmigrated into an era where everyone had Battle Beasts. Daemons were rampant and humans were forced to build walls around their dwellings while depending on Beastmasters to keep those monsters at bay.

Leo, a common middle school student, was accidentally invited to a Wechat group full of legendary immortals, such as the Monkey King, ErLang Sheng, the Dragon King of the East. Since that day, his life completely changed. With the mystical items receive from his WeChat group,

- Description from Novelupdates

“I really feel like having one of those special macarons from the cafeteria today. You think you could get me one?”I sit diagonally behind the heroine in class. I’m basically her errand girl.“We are [friends] , after all.”…And I’m happy to do it.

Time travelling from the majestic era after the Recuperation of Reiki, he became Kimura Kazuki, a 16-year-old high school student in Japan, one year before the Reiki Recuperation.

Tentatively, he set out to hone himself to the bone, burning candles at both ends to stockpile resources in preparation for the imminent Recuperation of Reiki. His goal was to be many steps ahead of all humanity when the time comes.

However, it seemed like fate had decided to play a cruel trick on him.

One year later, the Recuperation of Reiki… did not happen as expected.

- Description from Novelupdates