http://tvtropes.org/pmwiki/pmwiki.php/Recap/YuunaAndTheHauntedHotSpringsRyuugaFamilyArc
Chapter 13: Yuuna-san and Koyuzu get Spirited Away
The Black Dragon god, Genshiro Ryuuga, and his loyal second, Oboro, arrive in Yukemori City in search of women to marry into a harem for Genshiro. He ends up taking a liking to Yuuna upon seeing the spirit moving down the street alongside Koyuzu, and plans to take her back home to marry her. Koyuzu is unable to stop them, but Genshiro overhears from the little Tanuki that Kogarashi is already in a relationship with Kogarashi, which angers him. Oboro then opens up a portal back to their home, which Genshiro walks through while forcibly taking Yuuna along.
Chapter 14: Yuuna-san's Seven Transformations
Kogarashi and Sagiri come across Koyuzu on the street, which they learn from the little Tanuki that Yuuna was taken away by the Black Dragon god, Genshiro. Meanwhile Genshiro spends his time forcing Yunna to wear different types of clothing while Oboro prepares for their wedding. Kogarashi, Sagiri and Koyuzu eventually locate Genshiro's home, which is a castle that sits in the middle of a giant underground lake. The group splits up with Sagiri and Koyuzu sneaking in using the former's ninja abilities to find Yuuna while Kogarashi walks up to the castle's front door to act as the bait. Kogarashi is then brought to Genshiro by the latter's minions.
Chapter 15: Sagiri-san Qualifies
While Kogarashi keeps Genshiro preoccupied discussing things about Yuuna, Sagiri and Koyuzu locate the room where Yuuna's being kept. However, Oboro was keeping watch over Yuuna, and is able to defeat Sagiri in combat. Oboro then brings Yuuna and a captured Sagiri to Genshiro, which he qualifies Sagiri as another potential wife. Genshiro continues to taunt that he's going to make the girls his, and gives Kogarashi a punch. However, Kogarashi provides a punch of his own, which is strong enough to knock out the Black Dragon god in one hit due to a past possession where he was trained by a powerful psychic.
Chapter 16: Oboro-san's "Any Means Necessary"
As a loyal retainer of the Ryuuga Family, Oboro faces off against Kogarashi in a duel under the belief that she has the advantage since Kogarashi claims that he doesn't hit women. Kogarashi still refuses to hit back, but Oboro's actions are stopped by the arrival of Nonko and Yaya, who Koyuzu ran off to inform when she snuck away after Sagiri's defeat. Oboro eventually realizes that fighting the one who defeated Genshiro is stupid, and comes up with a plan that will leave everyone happy. When Genshiro wakes up, Koyuzu uses her transformation skill to make it look like Genshiro's loving antics have allowed Yuuna's and Sagiri's spirits to pass on to the afterlife, which Genshiro ends up buying. Afterwards, Kogarashi and company return to Yuragi Inn, but upon waking up the next day, he sees a naked Oboro lying next to him. As it turns out, Oboro has decided that her plan to further strengthen the Ryuuga Family is to have a child with Kogarashi since she witnessed how powerful he is.
Tropes
- Arc Villain: The Black Dragon god, Genshiro Ryuuga, serves as this for the arc along with Oboro as The Dragon.
- Curb-Stomp Battle: In the end, Kogarashi defeats Genshiro in one punch.
- Damsel in Distress: Genshiro takes Yuuna captive in this arc to try to make her his wife.
- Training from Hell: Kogarashi was once trained by a spirit who was a powerful psychic, which has provided Kogarashi spiritual powers strong enough to punch out the Black Dragon god in one hit.
