If I Don't Die, I'll Truly Be Invincible - Chapter 28 - What Are You Playing?

When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

[No fixed CP + wear books + brain hole cool text + women disguised as men + group pet]

Gu Lan crossed over and became the cannon fodder of the original book disguised as a man, counterattacked the protagonist of the original book who slapped her face, and lived in a dormitory full of sickly beauties.

Until one day, she discovered that her roommates were villains from other horror novels. After discovering the secret, Gu Lan thought she would be killed, but her roommates all looked at her strangely… Contrasted with cute Zhengtai, sickly and beautiful boy, split personality school girl, cold and stern school bully, romantic and noble son who plays Shura every day field.

- Description from novelbuddy

Lin Wanwan is a pitiful mentally-disabled girl. Not only does she suffer abuse from her stepmother, her stepmother even attempts to use her as a sexual commodity to pleasure others. Eventually, the poor Wanwan dies from an overdose…

[Fast Wear + Group Pampering + Gentle Female Lead + Crushing Scum]Su Zhiruan had died unexpectedly and was bound to the Childbirth System. Completing tasks would earn her eternal life and inexhaustible wealth.This sounds great!In her last life, she had no children. After binding with the system, she became blessed with many children and was pampered to the heavens by the male lead!All her children were obedient, sensible, and easy to raise, making her a true bringer of fortune![Scenario One]: Five years into the Emperor's reign, the harem had produced no offspring. After a night of passion with Su Zhiruan, the harem became filled with princes and princesses. The Emperor would dote on them even during court sessions, setting aside his imperial deportment to play with the children and personally teach the princes. His gaze towards Su Zhiruan grew increasingly fervent.“My dear, would you like to be my Empress, and together take care of our children, becoming my wife above all others?”[Scenario Two]: The most mysterious gentleman in the Capital City was rumored to be disabled. Approaching middle age without any descendants, his relatives eyed his fortune and wished him dead daily. Su Zhiruan's arrival utterly dispelled their schemes, as she bore this handsome man a brood of children. When she thought to leave, he held onto her, his normally cold and proud eyes filled with pleading. His voice was deep and low.“Wife, please don't leave me and our children. I beg you.”