Sougou Jikan Jigyougaisha Daihyou Torishimariyaku Shachou Senzoku Hisho Tanaka Seiji

Nagato Tokioka is the ultimate slacker with zero future aspirations. But when Seiji Tanaka, a battle secretary from the future, appears claiming that assassins from the future are planning to kill him, Tokioka's life is about to change forever.

(Source: MU)

Included one-shots:
Volume 2: Keibi Gaisha Sept Three Shachou Tanaka Seiji
Volume 3: Tokubetsu Kokka Koumuin Kaizousha Taisaku-ka Tanaka Seiji, Keibi Gaisha Sept Three Jitsudou Keibu-bu Shozoku Tanaka Seiji