https://www.dlsite.com/maniax/work/=/product_id/RJ01146946.html

https://www.melonbooks.co.jp/detail/detail.php?product_id=2297950
https://ec.toranoana.jp/tora_r/ec/item/040031131591/

Base +22

这什么鬼故事吗...?

Base +7

I'm pretty sure the story is that this girl is a perv, she would masturbate in class until some boys caught her and blackmailed her into having sex. Thinking that was the end of that, they revealed it anyway. She committed suicide due to thr shame and her ghost latched onto her effects, teacher brings them home and now he's haunted by a horn ghost.

Base +7

真的很无语...画风

Base +15

Yeah that's pretty much the story.
And the ghost spends most of the time saying things like "give me back my panties" and "don't tell everyone" and things like that.
Becomes more standard sex lines as it goes, to an extent.

Base +6

学級便所
https://akibablog.blog.jp/archives/51646857.html

Base +7