Ikeda Emi's birthday is on May 31st.

Also, the 2nd panel's speech bubble seems to be missing text, so I'll upload the correction if/when they fix it.

Edit1:

According to the artist (twitter #1928434396652060923), the text in the panel should be:

『特殊な訓練を受けた生徒が行っております。真似をしないでください。』
"This is done by a specially trained student. Please do not try this at home."