Mahiro in a Close Call

Mahiro in a Close Call (まひろ危機一髪!, Mahiro Kikiippatsu!) is a special chapter of Onimai! I'm Now Your Sister. It was originally published in EX Special 3 which was released on August 15, 2020.

Summary
Mihari makes a special medicine for Mahiro to help her feel warmer, but they run into trouble when Mahiro has Momiji drink it.

Plot
Mahiro is curled up in a blanket shivering from the cold. Mihari asks her what's wrong, and Mahiro says that she feels like she's about to turn into a snowman. She says that lately her fingers are always so cold. Mihari sighs a bit, noting that being hot natured is the fate of all girls. She notes that traditional drugs should be fine, but that there may be some side effects with how she is now. She tells Mahiro that she's got it and to leave it to her, saying that she'll make a special drink just for her. Mahiro is grateful, but notes that anything goes with Mihari.

A few days later, Mahiro is feeling better as shown off by the large smile on her face. She notes to Mihari that the medicine she gave her was very effective and thanks her for it. Mihari, in a lethargic way, says that Mahiro feeling better is all that matters. Mahiro notices something off and asks what's up with her. Mihari puts down an energy drink in her hand and notes that she's just a bit low on sleep. Heading to her room, Mihari explains that developing the drug kind of shifted her schedule around, and tells Mahiro to be quiet today. Mahiro agress, and Mihari closes her door to catch up on her sleep.

Mahiro heads downstairs and feels kind of like she did something bad, but decides to just be good and not bother Mihari for the day.

All of a sudden, the doorbell rings. Mahiro cringes a bit at someone being here, noting that this timing is the worst. Mahiro struggles to answer the door, asking who it is as she opens it slowly. It turns out to be Momiji who says hello to Mahiro. Mahiro freaks out for a second before realizing who it is, with Momiji asking her if it's bad that it's her.

Mahiro apologizes for freaking out and lets Momiji inside, telling her to get out of the cold, which Momiji is extremely grateful for. Momiji apologizes for coming over unannounced to play, but Mahiro says that it is fine as she had nothing to do. Mahiro suggests that they could start off with a game, but notices Momiji blowing on her hands while she's taking the controllers off her gaming system. Mahiro asks her if she's okay, and Momiji notes that she is still a bit cold.

Mahiro suddenly says that she has just the thing for that, much to Momiji's shock and confusion. Mahiro takes out the bottle of the warming drug, calling it "The Mihari Special Warm-You-Up Drink". She says that it'll make her crazy warm, and Momiji believes her since Mihari is a doctor. She decides that in that case she'll help herself and takes a gulp of it. When she's done, Mahiro asks her if she feels anything. Momiji says that she does, saying that her belly is nice and toasty, and so warm. She then notes that in fact, she's hot, much to Mahiro's shock. Momiji notes that her eyes are swimming, and then passes out much to Mahiro's shock. Mahiro notes that this is bad and piggybacks Momiji to her room, saying that she'll just set her in the futon for now.

In Mahiro's room, Momiji begins to wake up in Mahiro's futon. Mahiro, in a panic, asks Momiji if she's okay. Momiji says that she is and apologizes for making Mahiro worry. Mahiro says that it's her fault for giving her that weird drink and tells her to just rest a bit, which Momiji agrees to.

Under the covers, Momiji settles seeing Mahiro's smell as a plus. All of a sudden, something beneath the covers rises and wakes Momiji back up. She notes that something is stiff below her belly, and Mahiro offers to take a look. When Mahiro squeezes the covers, she recognizes it as a "comrade" and realizes in horror that Momiji has one of her own now.

Mahiro struggles to explain what it is, while Momiji jumps up in shock. Mahiro asks her if she was a guy all along, which Momiji thoroughly denies. She wonders how this happened, with Mahiro noting that Momiji's "comrade" is huge. Mahiro tells Momiji to calm down and to count pi, but notices Momiji giving her a look. Mahiro turns around and notes that they should first consult Mihari, but Momiji grabs her arm and tells her to hold it.

Momiji then pins Mahiro to the ground and climbs on top of her, much to Mahiro's horror. Momiji apologizes for this, but notes that when she looks at Mahiro, her body keeps getting warmer and she feels really weird. Mahiro squeals in terror, noting that she's in a real pinch. At this rate, the chapter will look with a doujin.

Mahiro tells Momiji that she can fight it, and tells her to think of her mom's face, but Momiji just pins down Mahiro further. Mahiro tells her to wait, then closes her eyes and realizes in horror that she's going to go "poof".

Nothing happens, and when Mahiro opens her eyes, she realizes that Momiji passed out from the heat again. Mahiro cries out Momiji's name, hoping that she's okay.

Sometime later, Momiji wakes up in the futon, completely cured of the drug's effects. As she awakens, she sees Mahiro and Mihari looking at her. Mahiro is relieved that she's awake, with Momiji sighing with relief that she's okay. Mihari asks Momiji how she's feeling, and Momiji wonders why she was asleep.

Momiji suddenly remembers what happened and places her hands under the covers to check. She finds that her "comrade" is gone. Mihari and Mahiro play dumb and ask her what's gone, and Momiji finds herself at a loss for words.

After a moment of trying to piece it together, Momiji concludes that that never could've happened, with Mahiro saying that she must've had a weird dream as she looks tired. Momiji admits that her memory is all fuzzy, and guesses that she didn't have enough sleep if she fell asleep. She apologizes to Mahiro, who says that its fine and tells her to get plenty of rest. Momiji waves goodbye and Mihari tells her to take care.

As soon as the door closes, Mahiro and Mihari sit on the floor back to back in relief that Momiji didn't find out the truth.

Mahiro asks Mihari whatr that drink was, as it turned into a huge issue. Mihari points out to Mahiro that she's the one who had her drink it, and reminds Mahiro that it was a special drug just for her. She explains that she put in an ingredient in to deal with the drug making her a girl for a little while. Mahiro understands, referring to that drug as a troublemaker.

Mahiro then realizes that Mihari could theoretically make a drug that could return her to normal and asks her about it. Mihari, not wanting to try, just says that she's so busy and runs away, despite Mahiro's protests.

Later, Mihari ponders the effects of the warming drug, and wonders if it was actually a massive breakthrough. Meanwhile, Momiji wondering about what really transpired.

Characters

 * Mahiro Oyama
 * Mihari Oyama
 * Momiji Hozuki

Trivia

 * Due to this chapter being published exclusively in EX Special 3, it has not received an official English translation or release, though an English fan translation is available for purchase at DLSite alongside the Japanese release.