The First Legendary Beast Master - Chapter 17: Proper Training Regimen

The Third World War has been ended by the efforts of Kamijou Touma. With that, he vanished. With the Magic Side regrouping, the Sabbath for their followers has arrived.

In the headquarters of the Science Side, Academy City’s strongest Level 5 Esper Accelerator has washed his hands off the “Darkness.” Along with Last Order and Misaka Worst, his days pass by peacefully with no sign of GROUP.

Hamazura Shiage has formed a new ITEM with Kinuhata, Takitsubo and Mugino. Peace has come to the hands of the alumni who have “graduated” from Academy’s Dark Side at last… at least until a new evil “first year student” appears before them.

— This is a follow up to the popular Toaru Majutsu no Index light novel series, where Kamachi-Sensei has promised to deliver new premises and give a totally new flavor to the fights and plot developments

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

In my previous life, I was half a move short and ultimately failed to reach the summit. Having traveled back to the past, this time... I want to become the strongest in this world! To become the strongest in this world, one only needs three simple steps: 1. Pick up a newly-transferred Demonic Sect Enchantress off the streets. 2. Subdue and vanquish the demon. 3. Take her cultivation technique for myself. Awesome! I’m already invincible! ———————— Years later, Yan Yu, who had earned the title of “the strongest,” was interviewed on television: Host: To whom do you want to give thanks for your success today? Yan Yu: I’d like to thank a very important woman to me. Host (eyes lighting up): Oh, is she your wise and virtuous wife? Yan Yu: No, consider her a stepping stone, I suppose. Host (wiping sweat): Then... what about the other members of your team? They must have helped you as well, right? Yan Yu: ... How could there possibly be only one stepping stone on the path to godhood?