At the beginning of each day, Yandere-chan can change her panties by interacting with the drawer in her bedroom. Yandere-chan can only put them on in the daytime. Different types of panties allow her to carry out various tasks with more ease, such as earning a reputation bonus or being able to commit murder with less risk of getting caught. In future updates, only some panties will be in Yandere-chan's drawer at the start of the game, and the rest will either have to be bought or unlocked. When walking to the drawer, a pink HUD pops up saying "Change Panties".
In the future, every rival will have unique panties. The player will be able to unlock her panties by eliminating her. Wearing them will grant a unique unknown buff that no other panties have.
Types of Panties
|"Only a boring girl would wear such plain panties!"||No bonus.|
|"How do these even work?! They look like they could slip off at any moment!"||Pools of blood created after murder will be smaller.|
|"Pink is the color of compassion, nurturing, and love."||Yandere-chan will receive a bonus when matchmaking two people.|
|"These panties are for the bedroom, not for school!"||Yandere-chan will receive a bonus when spreading rumors. The damage is always -2, unless combined with other variables.|
|"Underwear for old-fashioned girls. SERIOUSLY old-fashioned girls."||Yandere-chan will receive a bonus when studying school subjects. She will progress to the next rank of that subject much faster. She will have ten study points every time she goes to class on time.|
|"A girl who wears these panties must be sweet, just like strawberries!"||Yandere-chan will receive a bonus when complimenting students. Her reputation will be increased to two points per compliment, unless combined with other variables.|
|"Black is the color of mystery, secrecy, and evil."||Students will have a smaller range of sight - meaning that they won't detect murder or suspicious actions as easily.|
|"Ehhhhh? Nani? You're still wearing animal panties at your age?"||Less reputation penalty when performing Yandere Actions.|
|"The reason these are so popular is because the stripes show off the curves of a girl's butt."||Yandere-chan will receive a bonus when apologizing to students. Yandere-chan will gain 75% of reputation back.|
|"Spats can be worn as shorts or underwear. So, if a girl is wearing spats without panties underneath, and you see her spats, that technically counts as a panty shot! Are spats for sporty girls, or for exhibitionists?!"||Yandere-chan's running speed is increased to six meters per second, if not combined with anything else.|
|"A high-school girl has no business wearing panties like this!"||Yandere-chan will leave less bloody footprints.|
|"Senpai could never love a girl who wears such lewd underwear!"||Yandere-chan's sanity meter will decrease at a much slower rate. It will take ten kills to become completely insane.|
These panties were removed in the May 3rd, 2015 Build and replaced with newer, better models. The Speedy Sporty Spats, Cute Bear Panties, and the Stealthy Black Panties were present, but remain the same as the updated panties. The Kawaii Moe Shimpan panties were also present, but their design and effect was changed.
|"Red is the color of passion! It is also the color of fire, danger, and blood."||Pools of blood are smaller.|
|"Everyone knows that if a girl wears white panties, she must be a pure and innocent angel."||Less reputation penalty for performing Yandere Actions.|
|"Pink is the color of compassion, nurturing, and love."||Bonus when matchmaking.|
|"Blue is the color of trust, loyalty, and honesty."||Bonus when spreading rumors.|
|"Cyan is the color of wisdom, intelligence, and truth."||Bonus when studying School subjects.|
|"Yellow is the color of joy, happiness, and energy."||Bonus when complimenting students.|
|"The reason these are so popular is because the stripes show off the curves of a girl's butt."||The Sanity Meter will decrease slower.|
- The rest of the panty functions were implemented in the November 1st, 2015 Build, excluding the Girly Pink Panties, which function was implemented in the September 24th, 2016 Build.
- Yandere-chan will be able to wear the same kind of panties every single day for the entire game. Yandere-chan always washes and dries her panties before she goes to sleep.
- In the August 16th, 2015 Build Midori Gurin was given green panties; her panties were later changed back to white, however as of the August 15th, 2016 Build she again wears green panties.
- As of the June 1st, 2016 Build, Musume Ronshaku wears pink panties, and Oka Ruto wears black panties.
- As of the September 22nd, 2016 Build, Kokona Haruka wears purple panties.
- As of the February 2nd, 2017 Build, Yui Rio wears red panties, Yuna Hina wears yellow panties, Koharu Hinata wears green panties, Mei Mio wears dark blue panties and Saki Miyu wears cyan panties.
- YandereDev has said that in the future, Yandere-chan may be able to take a shot of her own panties and send it to Info-chan, but this has not been implemented yet.
- If a small town is implemented, the player may have to buy some types of panties. If not, then the player will have to perform certain actions to unlock achievements.