Neo Genma Taisen

(from ebookjapan):

The second installment in the popular "Genma Taisen" series. Humanity is on the verge of extinction after losing a battle against "Genma," the destroyer of the universe. Princess Beatrice, the leader of the Esper Squadron, plays her last trump card: humanity's only time leaper, Ojiki ────.

She is sent back in time to create more people with supernatural powers and to create a powerful esper squadron that will be ready to defend against the "Phantom Demon" when it strikes. Can the future of mankind be changed? This work is the basis of the novel version that became a huge hit. O-Time jumps to Edo in 1639!

Serialized in SF Magazine.