Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 2.5 | SEIRA | 2:18 | 阿保剛 | CHAOS;HEAD Original Soundtrack | 阿保剛 | Album + Soundtrack |
| 5pb.Records | FPBD-0073 |
| 4.4 | SEIRA | 2:18 | 阿保剛 | CHAOS;HEAD Audio Series Complete Box | 阿保剛 | Album + Compilation + Soundtrack + Audio drama |
| 5pb.Records | FVCG-1093 |
| 2.5 | SEIRA | 2:18 | 阿保剛 | CHAOS;HEAD Original Soundtrack | 阿保剛 | Album + Soundtrack |
| 5pb.Records | |
| Pseudo-Release | |||||||||
| 2.5 | SEIRA | 2:18 | Takeshi Abo | CHAOS;HEAD Original Soundtrack | 阿保剛 | Album + Soundtrack | |||
| 2.5 | SEIRA | 2:18 | Takeshi Abo | CHAOS;HEAD Original Soundtrack (English Translation of the HIRES version for digital download) | Takeshi Abo | Album + Soundtrack | |||
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