Tensei! Hanbei Takenaka: Surviving the Warring Feudal Japan with Fellow Tensei Warlords

Tensei! Takenaka Hanbei: Minor Bushou ni Tensei Shita Nakamatachi to Sengokuransei wo Ikinuku
転生! 竹中半兵衛 マイナー武将に転生した仲間たちと戦国乱世を生き抜く

Source

Takenaka Hanbee no Seizon Senryaku: Sengoku no Yo wo Ayatsuru "Chashitsu" no Naka no Eiyuu-tachi
竹中半兵衛の生存戦略 戦国の世を操る「茶室」の中の英雄たち
novel

An unremarkable bachelor office worker in his 30s awakens to find himself reincarnated as Hanbei Takenaka, the legendary strategist of Hideyoshi Toyotomi. Simultaneously, seven other modern Japanese men also find themselves reincarnated as warlords of the Sengoku era, Japan's warring states period. In a mysterious white void, they discover a PC displaying a "Chat-Shitsu" page, allowing them to communicate with each other. Can they work together to survive against seasoned warlords like Nobunaga Oda, Ieyasu Tokugawa, and Kenshin Uesugi? (Source: Orange Inc.)