{{DISPLAYTITLE:opt}}{{MusicArticle
| titlejp     =
| titlejprom  =
| titleen     =opt
| group       =[[Riverside]]
| groupCat    =Riverside
| groupCat2   =
| groupCat3   =
| groupCat4   =
| released    =2017-05-07
| convention  =Reitaisai 14
| tracks      =4
| length      =
| catalogno   =RSCD-0017
| genre       ={{Genre|Vocal}}, {{Genre|Acoustic}}
| website     =[http://riverside9.web.fc2.com/new/opt.html Link]
| image       =RSCD-0017.jpg
| banner      =RSCD-0017_banner.jpg
| banner_res  =x60
| arranger    =Cororo
:{{すのうまん}}
| lyricist    =
| vocalist    ={{秣本 瑳羅}}
| producer    ={{すのうまん}}
; Illustration & Design
:ryuno
| illustrator =
| designer    =
| masterer    =
| other_staff =

| description =It features acoustic, vocal arrangements of themes from ''[[Changeability of Strange Dream]]'', ''[[Retrospective 53 minutes]]'' and ''[[Magical Astronomy]]''.

| tracklist   =

*{{Track|01|{{lang|ja|そして少女は星を浮かべた}}|4:03|lyrics=Lyrics: そして少女は星を浮かべた}}
**''And thus, the girl floats on the star''
**arrangement: Cororo
**vocals: {{秣本 瑳羅}}
**original title: {{lang|ja|車椅子の未来宇宙}}
**source: {{MA}}

*{{Track|02|{{lang|ja|童葬祭}}|3:59|lyrics=Lyrics: 童葬祭}}
**''___''
**arrangement: {{すのうまん}}
**vocals: {{秣本 瑳羅}}
**original title: {{lang|ja|童祭　～}} Innocent Treasures
**source: {{CoSD}}

*{{Track|03|5{{lang|ja|月}}7{{lang|ja|日、終発}}36{{lang|ja|号}}|4:12|lyrics=Lyrics: 5月7日、終発36号}}
**'' 7th May, Last Train No.36''
**arrangement: Cororo
**vocals: {{秣本 瑳羅}}
**original title: {{lang|ja|ヒロシゲ36号　～}} Neo Super-Express
**source: {{R53m}}

*{{Track|04|{{lang|ja|空標}}|4:05|lyrics=Lyrics: 空標}}
**''___''
**arrangement: {{すのうまん}}
**vocals: {{秣本 瑳羅}}
**original title: {{lang|ja|　大空魔術　～}} Magical Astronomy
**source: {{MA}}

| notes       =
| review      =
| print_references =
}}