On 6 January, Shiori reached 600,000 subscribers on her YouTube channel.
On 13 January, Shiori debuted her third 2D costume. Shiori has two hairstyles, long hair with her bangs styled to left and a short ponytail. She can use a black hat. Shiori wears a red dress with black assets and lace, with a black ribbon as decoration. Under the chest, Shiori has a black corset. Her skirt has a lot of black belts. Shiori wears long, black socks with openings at the top tied together with small ribbons. The openings have crossed, partially see-through lace that extend above the socks. Shiori uses black shoes. Shiori can also wear a black cape above her dress and move her right hand up to her face.
On 27 February, during an Advent's friendship test collab featuring their casual costumes, each member had a hairstyle swap. Shiori has Nerissa's main hairstyle including the horns.
On 8 March, she debuted her hololive 6th fes. Color Rise Harmony 3D idol costume during the event's day 1 STAGE 1. The costume has some variants, it can be black or white, complemented with a color representative of the talent. The midriff can be covered or not. One has variant has a skirt while the other uses pants, with one leg exposed. Aside for the design featured in promotional material, the costume also includes a short jacket.
On 1 April, Shiori, Nerissa and Bijou, debuted buff 3D models.
On 4 August, -Advent- announced a project to celebrated their second anniversary, including "The Story of Advent", a five chapter series corresponding to five original songs about the journey of them, a holo no graffity episode, and a 3D live "On the Run!" on 29 August. A prologue video and their third original song "Genesis" were released on the same day.
On 29 August, during their second anniversary live "On the Run!", -Advent- debuted their 3D swimsuits first introduced in the hololive Summer 2023 event. The 2023 swimsuits are inspired in a sailor uniform. Members wear a two layered swimsuit, the first layer is blue from the straps going down diagonally to the center where each member has a mostly blue bow but one of the sides and the brooch are in one color representative of each member. The rest of the top is white. The edge has a semi circular cut. The lower piece of the first layer has two variants, one is a two layered blue skirt decorated with a white belt, a golden chain with some decorations hanging from it and a bow to the left and planks to the right. The second version is mostly the same but they wear blue shorts instead of a mini skirt. The second layer of the outfit is a matching striped bikini in white and another color depending on the member.
