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Before 1996, the area had been part of the five-member Kumamoto 1st district. Liberal Democrat Takeshi Noda, had represented the pre-reform 1st district since 1972 when he succeeded his deceased father-in-law Takeo Noda.
Note: The decimals stem from anbunhyō ("proportional fractional votes"), see Elections in Japan#Ballots, voting machines and early voting. As Takeshi (彪) Hayashida and Takeshi (毅) Noda have different Kanji for their given names, some voters must have voted for just "Takeshi" in Kana for the votes to be ambiguous.
References
"総務省|令和4年9月1日現在選挙人名簿及び在外選挙人名簿登録者数" [Ministry of Internal Affairs and Communications - Number of registered voters as of 1 September 2022] (in Japanese). Retrieved 2023-01-04.