If you're looking for anime similar to OATH, you might like these titles.
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The official music video for Ai ga Tarinai yo from the album S.O.N.O.M, by SONOMI
The official music video for Alphabed in from the album No.13, by flue.
The official music video for 1% no Koibito, by HoneyWorks.
The official music video for Vector Fish from the mini-album melon, by THE BINARY.
The official music video for Polaris from the album After Dark, by Aimer.