This is Doujin CG. bmp files are converted to png. files with smaller resolution than allowed on this site were upscaled with waifu2x.

The circle name is unclear but other doujinshi by this author are from the circle named "P.G Kikakukai (P・G企画会)" and so I've used that as the circle name on this item.

3 single pixel images completely void of any illustration are omitted.

Full CD image, extracted CG image, and all images presented here, in a single zip file:
https://mega.nz/file/bipVlCLB#e1n4jEXgrjzBLx_gPD4HZ43UvAzj9aa1uyjcAhotq5s

Base +16

今夕是何年

Base +4, shinpai -12

Correction - The circle name is established in this work as 雅女苑 (Gajoen) on file gajoen.htm (located in the files of vol 0 and vol 0.1):
雅女苑
旧名・『赤石沢貴士私設ＦＣ』。赤石沢貴士の同人誌活動の母体である。

Base +16