This is a list of songs that reached No. 1 on the Billboard Japan Digital Track Chart in Japan in 2018.
Chart History Issue dateSongArtist(s)RefJan. 1"Mabataki"(瞬き, Blink)Back NumberJan. 8Jan. 15"Hero"Namie AmuroJan. 22"One Day"Ryuji ImaichiJan. 29"Here Comes My Love"Mr. ChildrenFeb. 5Feb. 12"Party All Night~Star of Wish~"ExileFeb. 19"Here Comes My Love"Mr. ChildrenFeb. 26"Lemon"Kenshi YonezuMar. 5Mar. 12Mar. 19Mar. 26Apr. 2Apr. 9Apr. 16Apr. 23Apr. 30May 7"Play a Love Song"Hikaru UtadaMay 14"Kiss Is My Life."SingTuyo(Shingo Katori & Tsuyoshi Kusanagi)May 21"Lemon"Kenshi YonezuMay 28Jun. 4LoserJun. 11"Play a Love Song"Hikaru UtadaJun. 18Jun. 25"Tatakau Senshi-tachi e Ai o Komete"(闘う戦士たちへ愛を込めて)Southern All StarsJul. 2"Lemon"Kenshi YonezuJul. 9Jul. 16Jul. 23"U.S.A."Da PumpJul. 30Aug. 6"Bōen no March"(望遠のマーチ)Bump of ChickenAug. 13"U.S.A."Da PumpAug. 20Aug. 27"Ambivalent"(アンビバレント)Keyakizaka46Sept. 3"Idea"(アイデア)Gen HoshinoSept. 10Sept. 17Black BirdAimerSept. 24"Ai no Katachi"(アイノカタチ)MisiaOct. 1"Hero"Namie AmuroOct. 8"Sirius"(シリウス)Bump of ChickenOct. 15"Lemon"Kenshi YonezuOct. 22"Adamas"LiSAOct. 29"Hanashi ga Shitai yo"(話がしたいよ)Bump of ChickenNov. 5"Lemon"Kenshi YonezuNov. 12"Flamingo"Nov. 19"Old Fashion"(オールドファッション)Back NumberNov. 28Dec. 3Dec. 10"Hanaka Necromancy"(徒花ネクロマンシー)FranChouChou(フランシュシュ)Dec. 17"Flamingo"Kenshi YonezuDec. 24Dec. 31"Prologue"(プロローグ)Uru
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