{{MusicArticle
| titlejp     =解体少女／ロンリーデーズ
| titlejprom  =kaitai shoujo / ronriideezu
| titleen     =Demolition Girl / Lonely Days
| group       =[[東方事変|touhoujihen]] ({{lang|ja|東方事変}}) & [[N+]]
| groupCat    =touhoujihen
| groupCat2   =N+
| released    =2019-05-05
| convention  =Reitaisai 16
| tracks      =4
| length      =
| catalogno   =THJH-012
| genre       ={{Genre|Vocal}}, {{Genre|Pop}}, {{Genre|Rock}}
| website     =[https://touhoujihenkl.tumblr.com/ Link]
| digital     = [https://booth.pm/ja/items/2610687 BOOTH]
| image       =THJH-012.jpg
| arranger    =; Arrangement, Instruments, Programming
:NSY
| lyricist    ={{シュリケン}}
| vocalist    ={{茶太}}
| producer    =
| illustrator =
| designer    =
| masterer    =
| other_staff =
; Lyrics, Vocals & Design
:IZNA
| description =
| autogendesc = vocal

| tracklist   =

*{{Track|01|{{lang|ja|解体少女}}| |lyrics=Lyrics: 解体少女}}
**''Demolition Girl''
**arrangement: NSY
**lyrics: IZNA
**vocals: IZNA
**original title: {{lang|ja|少女さとり　～}} 3rd eye
**source: {{SA}}

*{{Track|02|{{lang|ja|馬と骨}}’19| |lyrics=Lyrics: 馬と骨}}
**''A Horse and a Bone''
**arrangement: NSY
**lyrics: IZNA
**vocals: IZNA
**original title: {{lang|ja|おてんば恋娘}}
**source: {{EoSD}}
**first release: [[悦楽バージン]]

*{{Track|03|{{lang|ja|ロンリーデーズ}}| |lyrics=Lyrics: ロンリーデーズ}}
**''Lonely Days''
**arrangement: NSY
**lyrics: {{シュリケン}}
**vocals: {{茶太}}
**original title: {{lang|ja|ハルトマンの妖怪少女}}
**source: {{SA}}

*{{Track|04|ann 〜calm warm Remix〜| |lyrics=Lyrics: ann～庵～}}
**''Hermitage ~calm warm Remix~''
**arrangement: NSY
**lyrics: {{シュリケン}}
**vocals: {{茶太}}
**original title: {{lang|ja|亡き王女の為のセプテット}}
**source: {{EoSD}}
**first release: [[spill over]]
}}