P. 1-15 > [タケル〇伝] (Takeru *ingen): This appears to be based off of a manga short by the name of Takeru Ningen (タケル忍伝), which is a continuation of sorts of Sasuke Ningen (サスケ忍伝). It can be found in a tankobon of Yoshihiro Kuroiwa's short stories under the title of Yume Katari (夢語り) published in 1986.
P. 16-24 > [超魔法少女マジカルアスカ] (Super Magical Girl Asuka): Appears to be a sample of an original creation. Images had to be converted from a PDF file. Some samples of Utsuro na Hitomi's content never get released in full, so as of right now this is the only version that exists.
Support the artist by buying an original copy: https://www.dlsite.com/maniax/work/=/product_id/RJ01017673.html
Utsuro na Hitomi (虚ろな瞳) is a group that, unsurprisingly, focuses mainly on the theme of "empty eyes" in a mind-control context. They also write (short?) stories and have audio dramas/snippets on the topic, which you can find on their DLSite page. If you like this type of content, please let them know by buying a copy and/or sending your feedback to uturo0123@yahoo.co.jp (email shared in text file included with original download).
I do translation commissions, generally within the hypnosis community, but I am open to most topics. Contact me on Discord at Themy#0379 or on HypnoHub under the username Themy.
I've bought Utsuro na Hitomi's voice dramas in the past and can recommend them if you like works that focus on the instant corruption / submission style of hypnosis. They're short but good.
I'm not sure, that is something you'd have to look for yourself. Considering the group is not very well known, I find it unlikely that you'd be able to obtain them without buying them yourself. If you're interested in getting one of them translated for you, I'd be happy to take that as a commission. If you go to Utsuro no Hitomi's DLSite page, you can find samples of the audio files if you're curious as to exactly what you'd be getting.