TENSEI! TAKENAKA HANBEI: MINOR BUSHOU NI TENSEI SHITA NAKAMA-TACHI TO SENGOKU RANSE WO IKINUKU

Tensei! Takenaka Hanbei: Minor Bushou ni Tensei shita Nakama-tachi to Sengoku Ranse wo Ikinuku summary:

Kuroda Kanbei Yoshitaka and Takenaka "Hanbei" Shigeharu are the two genius military advisors who led Toyotomi Hideyoshi to unify the nation.
A dull and unmarried salaryman in his thirties wake up one day to find that he had become Hanbei! He had been reborn along with seven other men of the same age and circumstance!
That night, he suddenly found himself in an empty room with a PC with a chatroom called "Tea Room' open. Apparently, he could use this to chat with his fellow reincarnators?
Will they be able to survive in this era of battle and strife?