Every character theme is an earworm and I'm not even mad about it. OTA-MA! is a Windows visual novel about otaku culture and the soundtrack goes full J-pop with dedicated vocal tracks for each heroine. "Moeru Honoo no Mangamichi" for Kirara has this fired-up anime opening energy, while "Yami ni Sasayaku Fujoshi" for Iina leans into something darker and more theatrical.
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The contrast is great. "Owari wa Owari janai" gets both a music box version and a full arrangement, and the music box one hits way harder somehow. Karaoke versions included too so yeah, they knew what they were doing. If you're into doujin VN soundtracks with actual vocal tracks, this one's stacked for a small indie release.