Handyman Saitou has never felt special in his life. When he’s dropped into a medieval fantasy world, he gathers a party of unique beings to survive. Surrounded by a heavy warrior, a spell-forgetting wizard, and even a divine fairy princess, he yearns to be helpful. But after Saitou saves everyone during a raid, it’s clear that having a handyman on an adventure isn’t just useful, it’s essential! 
(Source: Crunchyroll)

Shigeru Nagashima, known professionally as Choo, is a Japanese actor, voice actor and narrator. His former stage name was Yuuichi Nagashima, he changed his stage name to Choo on August 23rd, 2006. He is a graduate of the Nishogakusha University Department of Literature and received training at Bungakuza's research establishment and the Seinenza Theater Company before attaching himself to Production Baobab in 1986. He transferred to the Tokyo Actor's Consumer's Cooperative Society in 2007.

Choo's hobbies include badminton and jogging, and he is a licensed calligraphy instructor.

(Source: Wikipedia)

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Serialization of the original doujin 

Handyman Saitou has never been anyone special. All his life, he’s had average grades, ordinary athletic skill, a commonplace job… But his unremarkable path takes a turn when he wakes up in another world. Here, warriors, wizards, and elves accompany him on quests delving deep into dungeons, and Saitou realizes for the first time what it’s like to be needed. After all, who other than the handyman could be trusted to open locked treasure chests or repair his allies’ equipment? Beginning with a simple “thank you,” this is the story of an ordinary person’s fulfilling life. 
 
(Source: Yen Press)

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