Mahiro's Surprise Party

Mahiro's Surprise Party (まひろとサプライズ, Mahiro No Sapuraizupātī) is Chapter 36 of Onimai: I'm Now Your Sister!. It was originally published on Pixiv on January 25, 2020.

Summary
Mahiro's friends decide to throw her a surprise party for her birthday.

Plot
As the final bell rings, Mahiro asks Momiji to walk home together. Momiji gets nervous saying that she can't today, leaving Mahiro confused. Mahiro asks Miyo if she's interested, but Miyo claims to have an errand. The two walk out of the room without another word, leaving Mahiro speechless. Mahiro then realizes what's going on and smiles.

In a flashback, it is revealed that Momiji said to Asahi and Miyo that they had to throw a suprise party. She suggests that they prepare a big celebration in secret. Asahi points out that Mahiro's birthday has already passed. Momiji knows this, but bets that she'll still be happy about it. She asks Asahi if she'd be happy in the same situation, and Asahi agrees. Momiji tries to think of a way to really surprise Mahiro, and decides that it would be more surprising if it happens on an unexpected day. Miyo laughs and thinks to herself that Momiji sounds like a bad talent agent. Momiji tells everyone to get a present for Mahiro and to keep it a secret until the weekend, to which Asahi cheers.

The flashback is revealed to be Mahiro's imagination, who decides that it must be something like that as this stuff happens in anime all the time. She notes that usually the joke is that the person in question thinks they're avoiding her and breaks down over it, but notes that a trope expert like her can avoid that with ease.

Mahiro notices Asahi trying to sneak out of the classroom and puts her hand on Asahi's shoulder. Mahiro tells Asahi to be honest with her as she already knows what it going on. Asahi gets all worried and tells Mahiro to stay away from her, saying that she promised never to talk to her again. Mahiro is shocked and, contrary to her previous statement, collapses in a puddle of doom and gloom saying that it's all over.

That Sunday, Mahiro stays under the covers and refuses to come out. Mihari tries to wake her up, saying that it's past noon, but Mahiro refuses, saying that she wants to hide in her shell. Mihari tells Mahiro that she's sure that her friends didn't mean any harm and decides to confiscate Mahiro's blankets. Mahiro is shocked and cries in Mihari's lap begging her not to. Mihari is also shocked and tells her not to cry in her own little sister's lap. Mihari comforts Mahiro and remarks that she really lets every little thing get to her, telling her that she should be more confident in herself.

The doorbell suddenly rings, and Mihari points out to Mahiro that her friends must be here to see her, much to Mahiro's confusion. When Mahiro answers the door, Momiji is holding a gun at her, and Mahiro fears that she is being attacked. It turns out to be a confetti gun, and after firing it the girls wish Mahiro a happy birthday. Mahiro, who was hiding behind Mihari all scared, immediately becomes happy. She remarks to the others that they had her all worried, and Momiji is glad that Mahiro was surprised. Asahi apologizes to Mahiro for what happened, saying that the others made her be quiet about the surprise. Momiji explains that Asahi is a terrible liar, so they knew if she talked to Mahiro she'd spill everything. Mahiro understands completely and forgives her.

Mahiro recieves a pair of gloves from Momiji, which she thanks her for.

Miyo gives Mahiro one of her favorite books and suggests that she open it later. Mahiro can guess that it is another Yuri book.

Asahi gives Mahiro a special "Do-Anything Coupon", which Asahi says that Mahiro can use to boss them all around. Momiji and Miyo are shocked at this, while Mahiro says that deciding what to do with it is a tough question. After a moment of reflection, Mahiro decides that she wants each of them to remain her friends forever.

Momiji and Miyo are touched, but Asahi says that that's no good. She remarks to Mahiro that she should make them do chores or something. Mahiro feels embarrassed, especially after she dealt with it so gracefully.

Asahi recommends she give Mahiro a shoulder massage and Mahiro gets on board. Momiji notes that this is not going to end well.

Momiji adds that she brought a cake and says that they all baked it yesterday. Mahiro is impressed, but asks if it is safe. Momiji confirms that Kaede directed them while they made it. Miyo is left confused at why Mahiro asked that. Mahiro asks for Momiji to feed her the cake, and Momiji does so.

Mahiro says that she is thirsty, and Miyo brings her a drink.

Mahiro suggests that they watch some TV, and Mihari asks if she should turn it on for her.

Mahiro decides that all of this was perfect, then says that she needs to use the restroom. Asahi says that she'll go for Mahiro and rushes into the bathroom. Mahiro starts banging on the door telling Asahi to open up the door, and Mihari notes that this is poetic justice.

Eventually, Mahiro is able to reach the toilet just in time.

Characters

 * Mahiro Oyama
 * Mihari Oyama
 * Momiji Hozuki
 * Asahi Ōka
 * Miyo Murosaki
 * Nemu Fujimi
 * Nodoka Fushimi

Trivia

 * The events of this chapter take place at least one day after the previous chapter "Mahiro and the Guidance of the Stars".