Yongou x Keibi - Single Mind四号警备~一心一意; 四号警备~三人派对; 四号警备~二度风华; 四号警备~五分热度; 四号警备~六標準差; 四号警备~四张王牌; 四号警备~零時行動; 四号×警備 ―エイト・ノット―; 四号×警備 - サード・パーティ; 四号×警備 - シックス・シグマ; 四号×警備 - シングル・マインド; 四号×警備 - セカンド・ウィンド; 四号×警備 - ゼロ・アワー; 四号×警備 - ファイブ・ミニッツ; 四号×警備 - フォー・カード; 四号×警備―セブンス・ヘブン―; 四号×警備―テン・ゴング―; 四号×警備―ナイン・ライブズ―; 四号×警備-シックス・シグマ; 4th Guard; The 4th Guard; The 4th Guard - Five Minutes; The 4th Guard - Four Card; The 4th Guard - Second Wind; The 4th Guard - Single Mind; The 4th Guard - Six Sigma; The 4th Guard - Sixth Sigma; The 4th Guard - Third Party; The 4th Guard - Zero Hour; Yongou x Keibi

From Fantasyshrine: V.01 - Single Mind S&D Securities -- the 4th Guard gathers suave and intelligent professionals who are highly trained in combat. However, a reckless youth appears and is hell-bent on sticking to the intelligence manager, Taki Keiichi. Due to a previous assignment, Taki caught the attention of the yakuza and is now being pursued by this persistent rookie to join. "I'm not going away until you either come with me or kill me!" Amused by his earnest request, Taki offers for Yuuki to stay with him under the guise of his personal bodyguard. But Taki starts to develop a desire to oppress the ever obedient Yuuki... V.02 - Second Wind Kogami Shinobu is the number-one cool beauty of the Intelligence Department in the S&D Securities- the Fourth Guard, where suave and intelligent specialists gather in abundance. However, he doesn't seem to care for his partner, the laidback bodyguard Miharu "Shin" Shinnosuke’s pursuit. Why is it that Kogami stubbornly refuses to mix business with pleasure, as if he's scared of it? Then suddenly, Shin seems to have shifted his attention to the new charge he’s supposed to be protecting! What in the world will happen to their partnership--!? V.03 - Third Party V.04 - Four Card(s) V.05 - Five Minutes V.06 - Zero Hour V.07 - Sixth Sigma V.08 - Seventh Heaven V.09 - Eight Knot(s) V.10 - Nine Lives V.11 - Ten Gong