Yeah that's the one
Isekai Kaeri no Ossan wa, Fusei Sukiru de Fathercon Musume-tachi o Tororori ni
Sadly,yes
Kuroha & Nijisuke
The Results From When I Time Leaped to My Second Year of High School and Confessed to the Teacher I Liked at the Time
https://www.novelupdates.com/series/god-of-music/
Going by the ratings on NU the novel is very gritty and dark giving the reader a realistic approach to the feeling of betrayal and despair that...
「Omae Gotoki ga Maou ni Kateru to Omou na」 to Yuusha Party wo Tsuihou Sareta no de, Outo de Kimama ni Kurashitai
SHIKKAKU MON NO SAIKYOU KENJA - SEKAI SAIKYOU NO KENJA GA SARA NI TSUYOKUNARU TAME NI TENSEI SHIMASHITA
This might be it: yakudatazu skill ni jinsei o sosogikomi 25 nen imasarar saikyou no boukentan midori kashi no akia.
The duel starts at chapter 9
I would love to read the continuation of this
Isekai Kaeri no Ossan wa, Fusei Sukiru de Fathercon Musume-tachi o Tororori ni, should be what you are looking for
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