Synopsis
On the day of her hot spring trip with her boyfriend Yuuya, he suddenly cancels due to work. Her step-brother Hibiki immediately rebooks the reservation, and the two end up going on the hot spring trip together instead.
“This is just a family trip”—the protagonist tells herself this, but deep down, her heart wavers with feelings for Hibiki that she’s come to acknowledge.
Although she worries about her future with Yuuya, her current status as “someone with a boyfriend” remains unchanged. She resolves tonight: “I won’t be swayed by emotion…!”
Meanwhile, Hibiki also tries his best to behave as a proper “younger brother” so the protagonist can relax.
However, when he sees her sleeping defenseless in a partially undone yukata, his reason wavers. Before he knows it, his hands are reaching toward his own body—
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105 pages main + cover + afterword 1 page + announcement 1 page
Total: 108 pages
※Censored with white lines
※The protagonist has a boyfriend, so this contains NTR elements.
※This is the sequel to “I Don’t Know This Brother” and “I Don’t Know This Brother 2.”
Reading the series in order is recommended for full enjoyment.
Author X (formerly Twitter): https://x.com/hanyonmll
Get “I Don’t Know This Brother 3 – ” on DLsite
This Week’s Top Rankings:
Editorial Review
[Jordan’s Pick]
“I Don’t Know This Brother 3 – Hot Spring Trip” is the latest installment in what’s clearly become a fan-favorite series, and this entry leans into classic doujin appeal with its steamy hot spring setting. If you’re already invested in this brother dynamic, you’ll find the familiar tension ramped up in a new, intimate location where boundaries naturally blur.
The hot spring setting is a smart choice for this kind of story—it’s a staple of romance and adult manga for good reason. The Japanese clothing element adds visual interest and cultural flavor that appeals to fans who appreciate authentic details. The narrative centers on forced proximity and escalating situations that fans of age-gap romance and step-sibling scenarios will recognize as genre comfort zones.
What makes this installment work is its understanding of pacing. Rather than rushing into explicit content, the work builds tension through the setting itself, with moments of vulnerability and unexpected reactions that feel grounded despite the scenario’s intensity. The focus on sensual details like nipple play suggests a more nuanced approach to physical intimacy than purely graphic depiction.
The masturbation and NTR elements signal this isn’t pulling punches, but they’re integrated into a narrative framework rather than existing in isolation. For series veterans, this third volume rewards your investment with escalation that feels natural within the established dynamic.
If hot spring settings, age-gap tension, and step-sibling narratives appeal to you, this continuation delivers exactly what fans of the series expect—find it on Henhenta.
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