The supporting character's harem is very normal - Chapter 128 I... just want peace.

ps: The 2019 new book “Return to Eighteen Boys” is already fat! !

An Feng, a mediocre clerk, obtained super technology and wealth by chance and coincidence. With the ultimate goal of making (cheat) money by manufacturing next-generation man-made diamonds, he traveled across the ocean and dealt with the American people. A series of stories about pursuing dreams, pursuing freedom and changing lives happened.

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- Description from novelbuddy

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.

Lucas Tanaka, a 30-year-old Japanese man who gave up his dream of becoming a soccer player, lives a monotonous life in Tokyo. After an act of bravery that results in a fatal wound, a glowing screen appears in front of him. [The skill “System” has been granted.] [“System” unlocked.] [The skill “System” has given to you the skill “Supernatural Resistance”.] [“Supernatural Resistance” unlocked.] [Thanks to the divine effect of “Supernatural Resistance”, from now on death is no longer a problem for you]. When Lucas wakes up, he finds himself on a vast soccer field, back in his youth, in the middle of a match with his childhood friend. With new skills and an unexpected chance to relive his dreams, Lucas is faced with the opportunity to redefine his destiny, but first he must overcome the normal challenges of a young soccer player, such as becoming a starter, winning the regional championship and become a professional soccer player! [The hidden function of the skill “Champion System” has been unlocked.] [The skill of “Replicator Genius” has been granted]. [“Replicator Genius” unlocked]. __________ What you can expect: Action, well-developed relationships, an MC who has attitude, a complex system that evolves, an MC who gets really strong, Slice of Life, manga content. The MC is proactive, he knows how to adapt, but he’s not a genius who knows literally every possible future for all his actions.

I am Supreme

Spread or announce my might in the world,

I am the Supreme

Medicinal material is poison if it cannot cure; a man who does not become a god will perish as ashes

………

Heavenly order has flaws, humanly world has injustice

Cast aside romance, for evils prevail

Misery brings forth kindness, rage won’t lead to disputes

Beyond principles and rules, let me carry out the execution

Spread my might in the world, slaughter injustice of the world

Blade in hand, passion in heart;

Passing judgement for life or death, sentenced by heroes with the blade,

Staring at the world with cold eyes, I have no regrets in my life

……….

Yun Yang is the central figure of the Nine Supremes of Yutang, heroes of the world. When the Nine supremes were ambushed and killed at Tianxuan Cliff, Yun Yang was the only one to escape the massacre albeit with heavy internal injuries. Watch as he takes revenge for his brothers against all those involved.

- Description from MTLNovel