Hana Ni Arashi by Kovachi Luka — Ongoing

Also known as A Storm Among Flowers

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Happiness is oft hindered: clouds over the moon, storms amongst flowers——a metaphor for how good things come with many interruptions. Chidori and Nanoha go to the same all-girls high school. They're best friends—and lovers. But they're keeping their relationship a secret from everyone. Hiding from prying eyes, they spend their days flirting sneakily, fretting from the constant interruptions. A "secret" relationship diary between two girls. Join as their accomplice to watch over them, grinning from the shadows.
[from Sunday-Webry]

Volume 1
Chapter 1: Me and Nanoha released Apr 11 '18
Chapter 2: Lunch With Everyone released Apr 11 '18
Chapter 3: Their Relationship released Apr 19 '18
Chapter 4: Together in the Club Room released Apr 19 '18
Chapter 5: The Corners and the Center released May 3 '18
Chapter 6: Behind the Curtains released May 3 '18
Chapter 7: Sneaky Mischief released May 21 '18
Chapter 8: Feeling and Intent released May 21 '18
Chapter 9: Future Relationship released Jun 14 '18
Chapter 10: The Beginning Of Their Love - First Part released Jun 29 '18
Chapter 11: The Beginning Of Their Love - Second Part released Jul 6 '18
Chapter 12: Sometime, the Two of Us released Jul 21 '18
Volume Extras released Jul 21 '18
Volume 2
Chapter 13: Boyfriend and Girlfriend released Jul 21 '18
Chapter 14: The Usual Time released Jul 25 '18
Chapter 15: After a Fight released Aug 4 '18
Chapter 16: Serious Cheering released Aug 12 '18
Chapter 17: Their World released Aug 20 '18
Chapter 18: Soft and Cool released Aug 28 '18
Chapter 19: Going Out In Uniform released Sep 6 '18
Chapter 20: A Girls Propriety released Sep 20 '18
Chapter 21: Outside and Inside released Oct 2 '18
Chapter 22: Beginning of Their Love Continued, Part One released Oct 14 '18
Chapter 23: Beginning of Their Love Continued, Part Two released Nov 1 '18
Chapter 24: Summer's Beginning released Nov 7 '18
Volume 2 Extras released Nov 7 '18
Volume 3
Chapter 25: Irrepressible Heart Pounding released Nov 15 '18
Chapter 26: A Secret Rendezvous (Part One) released Nov 28 '18
Chapter 27: A Secret Rendezvous (Part Two) released Nov 28 '18
Chapter 28: Their Heat released Dec 17 '18 Food
Chapter 29: Chidori's Glasses released Jan 12 '19 Glasses
Chapter 30: Birthday Surprise released Feb 1 '19 Birthday
Chapter 31: Give Me A Reward released Feb 13 '19
Chapter 32: The Best Summer Vacation released Mar 8 '19
Chapter 33: The Long Hoped-For Sleepover (Part 1) released Apr 5 '19
Chapter 34: The Long Hoped-For Sleepover (Part 2) released Apr 10 '19
Chapter 35: The Long Hoped-For Sleepover (Part 3) released Jun 6 '19
Chapter 36: The Long Hoped-For Sleepover (Part 4) released Jun 21 '19
Volume 3 Extras released Jul 25 '19
Volume 4
Chapter 37: Hide-and-Seek Chidori released Jul 25 '19
Chapter 38: A Trip to the Beach (Part 1) released Jul 25 '19 Beach Swimsuits
Chapter 39: A Trip to the Beach (Part 2) released Jul 25 '19 Beach Swimsuits
Chapter 40: A Trip to the Beach (Part 3) released Jul 25 '19 Beach Swimsuits
Chapter 41: Summer Storm released Aug 2 '19
Chapter 42: Back Then: Beginning released Aug 7 '19
Chapter 43: Back Then: Middle released Aug 7 '19
Chapter 44: Back Then: End released Aug 7 '19
Chapter 45: Their Trial released Aug 12 '19 Exes
Chapter 46: Decision and Parting released Aug 28 '19 Exes
Chapter 47: Flowers After The Rain released Sep 13 '19
Chapter 48: Her Side of the Story released Sep 27 '19
Chapter 48.5 released Sep 27 '19
Volume 5
Chapter 49: Fireworks' Echo released Nov 22 '19
Chapter 50: Awkwardness released Nov 25 '19
Chapter 51: Happiness released Nov 26 '19
Chapter 52: Summer Memories released Nov 26 '19
Chapter 53: A Girl's Secret released Nov 29 '19
Chapter 54: Love's Retreat released Nov 30 '19
Chapter 55: Secrets in the Dark released Nov 30 '19
Chapter 56: Their School Festival released Dec 1 '19
Chapter 57: My Precious Friend released Dec 1 '19
Chapter 58: Unchanging Feelings released Dec 1 '19
Chapter 59: Distance from Her released Dec 1 '19
Chapter 60: Best Friend and Lover released Dec 1 '19
Volume 5 Extras released Dec 1 '19
Volume 6
Chapter 61: Album of Memories released Dec 6 '19
Chapter 62: A Touch of Resistance released Dec 6 '19
Chapter 63: Secret Love Letter released Dec 6 '19
Chapter 64: Payback released Dec 7 '19
Chapter 65: Heart-Pounding Commute released Dec 7 '19 Kabedon Public Transportation
Chapter 66: Special Moments released Dec 9 '19
Chapter 67: Secret Consultation released Dec 15 '19
Chapter 68: Stormy School Trip 1 released Dec 15 '19
Chapter 69: Stormy School Trip 2 released Dec 15 '19
Chapter 70: Stormy School Trip (3) released Dec 21 '19
Chapter 71: Stormy School Trip (4) released Dec 21 '19
Chapter 72: Stormy School Trip (5) released Dec 21 '19
Chapter 73: Stormy School Trip (6) released Dec 21 '19
Volume 6 Extras released Dec 21 '19
Volume 7
Chapter 74: Baring Ourselves Part 1 released Jun 2 '20
Chapter 75: Baring Ourselves Part 2 released Jun 2 '20 Bath
Chapter 76: Souvenirs released Jun 7 '20
Chapter 77: Contrary Feelings released Jun 11 '20
Chapter 78: An Empty Heart released Jun 11 '20
Chapter 79: The One Naa-chan Chose released Jun 11 '20
Chapter 80: A Serious Talk released Jun 11 '20
Chapter 81: Truth and Lie released Jun 11 '20
Chapter 82: Each of Their Feelings released Jun 11 '20
Chapter 83: Chatty Fingertips released Jun 29 '20
Chapter 84: Moments Pile Up released Jun 29 '20
Chapter 84.5 released Jun 29 '20
Volume 8
Chapter 85: Returning the Favor released Nov 27 '20
Chapter 86: Just for Me released Jan 2 '21
Chapter 87: Prank and Payback released Jan 24 '21
Chapter 88: Nanoha's Idea released Feb 8 '21
Chapter 89: Dreaming of Tokyo released Feb 19 '21
Chapter 90: Our Futures released Mar 29 '21
Chapter 91: Churning Thoughts released May 14 '21
Chapter 92: Nanoha's Relationship Counselling Room released Jun 13 '21
Chapter 93: Casual Comment released Jun 17 '21
Chapter 94: Anything for a Friend released Jun 17 '21
Chapter 95: An Intimate Interruption released Jun 17 '21
Chapter 96: A Girl's Ideal released Jun 17 '21
Chapter 97: A Cheery Day released Jun 17 '21 Legs
Chapter 97.5: Volume 8 Extra released Jun 17 '21
Volume 9
Chapter 98: A Special Day released Aug 28 '21 Christmas
Chapter 99: Perfect Family released Sep 2 '21 Christmas Product placement
Chapter 100: Snowy Night released Sep 2 '21 Christmas
Chapter 101: Matching Lips released Sep 15 '21 Christmas
Chapter 102: New Year's Resolution: Nanoha's Side released Oct 5 '21 New Year's
Chapter 103: New Year's Resolution: Chidori's Side released Oct 13 '21 New Year's
Chapter 104: Feelings Build Up released Oct 17 '21
Chapter 105: Her Scent released Oct 17 '21 Smell
Chapter 106: How to Stop Hiccups released Oct 29 '21
Chapter 107: Sweet Temptation released Nov 6 '21
Chapter 108: Their Relationship released Nov 9 '21
Chapter 109: Advice from a Sempai released Nov 16 '21
Volume 10
Chapter 110: Assortment of Happiness released May 29 '22 Valentine's
Chapter 111: A Dream in Spring released Jun 9 '22 Sleeping
Chapter 112: Their Choices released Jun 9 '22
Chapter 113: Their Decisions released Jul 4 '22
Chapter 114: Stuck in the New Term released Jul 12 '22 Smell
Chapter 115: The Usual Place released Aug 5 '22
Chapter 116: First Anniversary, Part One released Aug 19 '22
Chapter 117: First Anniversary, Part Two released Sep 28 '22
Chapter 118: Time Remaining released Oct 5 '22
Chapter 119: Special Tutorial released Nov 7 '22
Chapter 120: When to Confess released Nov 11 '22
Chapter 121: Moonlight and Doughnuts released Nov 11 '22
Chapter 122: Talking about Her released Nov 26 '22
Chapter 123: Dangerous Answers released Dec 16 '22