I'm looking for recommendations of manga where two (or more) characters who were previously very close (e.g. siblings, best friends) had a big falling out and became estranged for some time, but get reconciled during the course of the manga.

I'm particularly looking for themes surrounding forgiveness and acceptance and the bonds between people.

Additional points:

• Strongly preferred to be a platonic relationship (family or friends) rather than romantic.
• However, romantic pairs are acceptable too as long as the reason for the falling out is NOT because of cheating or unrequited love.

All genres and all settings welcome. Thanks!

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Do Whatever You Want has this between several friend pairs, but they don't so much "fall out" as "drift apart" or "accept each other" as "drift back in together again," so I'm not certain you'll like it. It's a lovely story, though.

Hatsukoi no Atosaki, which is BL. The breakup was because of one of the two's internalised homphobia, not cheating or unrequited love.

Isagi-Kojima, iirc. Again, they don't really have a falling out as such.

Pink to Gray, but the reconciliation is a bit...unique (can't explain further because of spoilers). It's worth a read, imo.

Tenshi no Uta (NISHIDA Higashi), maybe, but there's a somewhat incestuous undertone to it.

Adekan and Muhyo to Rouji no Mahouritsu Soudan Jimusho both have this kind of relationship at the core of the plot, but the plot itself is complicated enough that the specific theme of rebuilding those relationships isn't exactly focused on, though reconciliation does happen eventually. Still pretty good series in their own right, though.

Hanaotoko doesn't have a falling out, per se, but a kid who always thought his father was weird and lame slowly, over the course of the series, begins to realise otherwise.

Titles that fit with no reservations:
Watashi no Taisetsu na Tomodachi
Not Simple
The Clock Workers

Ao no Futsumashi, maybe? I dropped it ages ago, so my memory isn't reliable. And in that same vein, Arago.

Thanks so much for the suggestions, calstine! Some of these titles I've previously read and really enjoyed them (Adekan and Hatsukoi no Atosaki, namely), and I'll definitely be picking up the others for a read.

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I just wanted to come back to say I've just finished reading Pink to Gray and am currently still shell-shocked. I have very complicated feelings right now. The "unique reconciliation" as you delicately phrased it hit me like a trainwreck and I both love and hate you for this recommendation. Perhaps not quite what I had in mind when I posted this request, but a poignant read regardless, so thank you.

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I'm glad you found it to be a good read! It was a very lovely, touching and unusual story, and I'd been looking forward to recommending it to someone, so, success!

A few more recs:
Uso Tsuredure
Yakusoku Siren
Haruka na Machi e
Chiyoko Chocolate
Golden Days