Episode 161

Miroku's Past Mistake is the 161st episode of the InuYasha anime.

Summary
Inuyasha, Kagome, Miroku and Sango are walking along a trail and Miroku is seemingly upset over getting pick-pocketed by a man. But, instead, he uses his supposed upsetness to stroke Sango's bottom in a hug. (This is noted to be the first of a few times he's actually gotten away with groping her since Sango does nothing to stop him, just simply saying, "Miroku..." and closing her eyes as she blushes while he is stroking her). Kagome says to Inuyasha and Shippō "What he does, and what he says are complete opposites. As usual." Both sigh in agreement.

Some villagers place a charm on a shrine, praying that the soul will find peace. As they do, the ground shakes and the water roils.

As Inuyasha and companions arrive to offer help, one of the villagers recognizes Miroku and asks if he has returned to fulfill his promise and marry his daughter, shocking everyone since Miroku is engaged to Sango.

In the village, Miroku is unable to recall the promise at first. However when a young lady arrives, the memory seems to return when he recognizes the girl from his past. The girl, Shima, used to be sickly and frail. But as he passed through the village one day he healed the girl and left - after making his usual proposition to the girl. Shima claims that the medicine as well as her promise to Miroku is what kept her going. These events soon cause a great strain on Miroku and Sango's relationship as Sango becomes further and further upset now fully taking in Miroku's womanizing past.

The house begins shaking again, making Shima cling to Miroku in fright. Miroku can only think to himself "So am I, but for whole other reason!" Inquiring into what is making the quakes, the companions learn that the water demon who lives in the shrine, the Master of the Lake, has claimed Shima as his bride and refuses to give her up. Shima explains she tried informing the Master of the Lake that she is already engaged. Nervous, Miroku questions who it could be. Kagome and Sango yell that it's him. Putting the awkward moment aside, Miroku vows to make sure Shima doesn't have to marry the demon. However, Shima's father takes this as accepting the marriage and begins preparations.

That night, everyone but Miroku is outside on guard duty. Shippō wonders why Miroku is the only one inside, making Kagome explain that Miroku is trying to explain that he is already engaged to someone he loves. This confuses Shippō, who still doesn't understand relationships well. Inuyasha asks Sango, who is upset, if she can trust Miroku to be alone with Shima, quoting "Only a fool refuses a woman who offers herself." In anger, Kagome tells him to sit; she berates him for saying something so dirty and questions if he actually took Sango's feelings into account. Sango is left thinking that she was placed second in importance. Inside the house, Miroku wonders why the Master of the Lake would give up if Shima was wed, learning the demon wants a virgin as his bride; if a marriage ceremony was held, the Master of the Lake would give up on Shima. Shima's father makes the same quote as Inuyasha, making Miroku laugh uncomfortably. At that moment, what appears to be an exaggeration of an angry Sango appears before them, calling Miroku's name. However, it's actually Shippō, who wished to convey Sango's feelings to Miroku. Sango enters and takes Shippō back outside, but not before giving Miroku a look and thinking "Drop dead, idiot". Stunned, Miroku immediately knows what Sango was thinking. They question Miroku as to who Sango is. Right as he's about to explain, the ground begins shaking.

Outside, the ground bursts at the gate, revealing a rather ugly water demon dressed in formal attire, bringing a cart of gifts with him. Inuyasha, Kagome, Shippō and Sango are left unimpressed, expecting something a bit more frightening. When Shima continues to hide behind Miroku, the Master of the Lake wonders why she is refusing as he was promised her hand in marriage; everyone is confused. Shima's father explains that he had promised the Master of the Lake anything in return for his daughter's good health; he didn't know his prayers were actually being listened to. Shima then confesses to the Master of the Lake, as well to her parents and the group, that she is not a virgin. She insists that she had slept with Miroku and gave her virginity to him (causing Sango to be silently enraged upon hearing this) and is thus unfit as a bride. The Master of the Lake, furious that that he had been lied to, soon transforms and attacks the village. Sango also rejects Miroku, saying that she doesn't think things will work out between them after, all while Inuyasha attacks the demon which she seems to be unfazed by, stunning Miroku that she is ending their engagement.

Miroku tries to explain things to her asking if he could even give his side of the story, but Sango runs off clearly distressed and Miroku is left gut wrenched that she doesn't trust him. Miroku soon reveals to Inuyasha, Kagome and Shippō that he had actually been falsely accused of the things he had supposedly done with Shima and that his heart "was focused on one person and one person alone." (This being Sango.) While they are distracted, the master of the lake kidnaps Shima.

Sango rescues Shima from the demon, but is caught by the demon. When the demon gloats that he shall keep Sango as his mistress, Miroku leaps into the lake after them declaring that no one will go after "his woman," and declaring Sango his and his alone, clearly shocking Sango. Miroku then uses his Wind Tunnel to remove all the water from the lake and defeats the demon. However after the defeat of the demon, Sango walks away from Miroku, seemingly still upset. Miroku chases after her, but as she continues walking away, she smiles to herself. Miroku sees and smiles as he continues chasing after her as the others watch from nearby.

Shima soon confesses that she lied about sleeping with Miroku, resulting in Sango and Miroku patching things up and finally smoothing things over with each other. However, when they're walking away Shippō asks Miroku why he didn't explain things sooner to clear up the misunderstanding; he then asks if it took him a long time to remember. This comment shocks Miroku in place. Inuyasha tells Shippō that he hit the bulls-eye on that one. Grabbing Miroku by the collar, Sango demands to know if Shippō is right. Sweating profusely because of a possible beating, Miroku says "Well, it was so long ago."