I'd wish someone translate the After (not sure why it's on a different page considering in the author pixiv is in the same collection)
The couple moment were heartwarming and exceptionally cute, albeit the ending is a bit unsatisfactory, I'd liked to see a bit more of fight with the father/director before the moving.
I would also have actually liked if the author did their research on the condition, as I found the medical aspect, quite laking. As I'm curious I did a fast review of the literature. I understand the suspension of beliefs, but that exhausted at the age gap and the fact an hospital allowed an intern to sleep into the room of a minor patient.
First of all the condition is too generic: sun allergy involve 3 different pathology. The specific pathology is called "sun urticaria" and it's the most serious one, as it's the only one that is classifiable as proper systemic allergy, involving Dyspnea, Tachycardia, Blood pression issue and anaphylactic shock (I suppose the one they showed during the collapsing scene, even if in that instance there were absolutely no skin issues, as it would be normal to expect,also where the fuck did they injected the drug?)
Sun Urticaria, while difficult to treat is actually very rarely a potentially fatal disease with anaphylactic shock. Seriousness of symptom depend on exposure and from the info I found to trigger anaphylaxis an affected with the most severe type should take quite the uv amount in multiple part of the skin. Using shades do help (so expecially in mornings of evenings when the sun is low, uslng covering dresses and a large hat), using UV (UVA-UVB) high protections creams help reduce the absorption (albeit it doesn't null it), at least when the sensibility doesn't bleed into visible light (yes it exist, these subject could experience issues even with indoor lights and lights from electronic devices as cellphones and pc screens). There are some studies that test antistaminics (class of drugs used to counter allergic reactions) and they do allow a complete or partial rmeission of symptoms for many cases, albeit some are unresponsive, which another drug can help treat these (remission in this case means control, as in avoid symptoms or reduce them). In case of partial remissions a strategy of medications and reduced solar exposition (using the means above) can improve quality of life. Another therapy is hardening, consisting of exposing the skin in a controlled way to the affected wavelenghts. It take an unspecified amount of try, depending on the patient. This techique is done in multiple allergen case and it do work in many (multiple stings venoms, some foods,etc), however in this specific case it involve exposition to a mutagen and carcinogenic agent (UVB mostly, UVA is less mutagenic).
Also while there can be triggers in subtances in all sun allregy types (mostly drugs, but even some plants or foods) and these triggers should be identified and avoided if you want to try to live a daily active life, it doesn't make sense to restrict them, to our case, a girl in hospital setting that go out during the night. Granted she may have another allergy, it isn't uncommon to have more then one (I have three for example, albeit all related (dust, dog fur and cat fur)), but this should be explicited.
I do instead appreciate seeing an experimental drug failing with adverse effects, it can happen in RL (the father of a friend had a deep adverse reaction with a bowel cancer related drug (not even experimental), the one that was literally specific for that type and one that had excellent success ratio). The adverse effect can also be an allergic reaction or anaphylaxis, as again happened here (albeit it seems like the simulated redness on the skins in the panels seems to imply that the drug triggered an attack of the sun urrticaria, that without the sun or related radations isn't possible, its' true that red skin is present in other types of allergic reactions)
Born with the disease: For completition of information sun allergies of all types can be present in newborn after the devlopment of immune systems (IIRC 3 month), but most of the time is acquired late in life (post 20/30 or even more). As many allergies, the onset can be improvvise, and can suddenly go into spontaneuous remission (more common in childrens, rarer more the onset is late in life). During life with the disease the instensity of it can vary (sometimes even between days) increasing or decreasing severity of the attack.
Shown tests and procedures: Exclusing the fact that as was shown at then end the hospitalziation wasn't needed at all (but I can understand that the father wanted to keep her close in his hospital, at least to avoid keeping her segregated alone at home all day, and at least she got to in person school lessons), what irked me are the test shown. The nurse asking for fever (without exposition to the triggering allergenic it's useless unless you suspect there is a fever from other causes (as can happen in hospitals, when my grandma got hospitalized for infartion, she got pneuomonia as more then half of the other patients present in the ward )) and the intern (amazing just read this manga and forgot all names despite being one of the MCs) that were using the stetoscope also doesn't make sense (again you can use it to detect strange sounds from the lungs, however they could be present during an active attack, and maybe for a bit after it's cessation, but we got no evidence of it). Again actions could make sense with proper context, but no context was given.
Another grievance is with the procedure for the experimental drug. Risky procedures could be sometimes be made directly in ICU (os subintensive care units, that many big hospitals have). The recovery from the attack was also strange. The timeline wasn't explicit but there is a day night transition (day with a Touka now asleep and masked but back in the ward, night her alone without the mask) so I read it like the same day. I can deal with a drug induced anaphilaxys having a longer subsidiation time and other non standard consequences, if it actually was it (if not the author did a poor job). That night she woke after a kiss, and was lucid and able to move her arms (sign that probably she woke up before, as rising form long period of uncosciouness can at start cause confusion and language impairements). Then the next chapter we learn she was bedridden for a week. Why? I suppose this may be not toally a fault of the author. Many practicians of medical sicence still do offer extensive bed rest (some times complete) for multiple conditions, despite it not only being useless (no improvement on the actual condition, in most cases) but harmful (it do cause loss of muscular tone and mobility and it increase the risk of thrombotic events) as multiple studies found. Now the risk for a week is little however for this to be believable that it was needed, the context of the damage made by the drug requiring a week of total bedrest should had been inserted into the story.
Also I see no catheter, so she should at least go out the bed and in the weelchair to pee.
For example cardiac catheterization ablation (a techinque where a catheter is inserted into a vein and it's used to "kill" certain tissues of the heart involved in arrythmias generation ) have a recommended recovery time of bed rest of 3-6 hours despite one of the possible complicances are post operatorial cardiac arrythmias (however generally of the benign type) that generally resolve in few days (many times with the patient out of hospital ).
The more probable complication of anaphilactyc shocks are secondary shocks (they have a precise name I don't remember) that are shocks that can happen without exposition to the allergen after even 2 days the first one occurred even with complete recovery from it (this is why people admitted for this are generally kept in observation, some times in the ICU depending on how many doctors are present if it involve a night shift observation), and as we don't see many people in this manga hopsital at night it seem a protocol mistake.
Another irk is the chapter before when sensei was disucssiong the new treatment. While what she said is correct (trying a new drug alone or while other drugs were in use is risky) it's what she said before that make no sense ("your body manage dto remain stable becouse of daily dosages and restircted diet"). The first I imagine is for the dosage of drugs (restricting diet doesn't make sense unless she either as another allergy or in very specific conditions ). However why is she taking drugs? An allergy (as sun urticaria) doesn't require drugs to keep the body stable if it's not exposed to the antigen. Allergies doesn't work like that. She could have been taking drugs to try a pharmacological protocol to try to reduce or eliminate symptoms (keeping the disease under wraps if exposed to the trigger) as many allergic people for airborne allergens took antistaminics to try to reduce or eliminate the symptoms, to treat even midler attacks of the illness (doesn't seems this case) or to cure damage (some damage of inflammatory nature may be possible due to the immune system cells misactivations (as it's imply happened to Touka after trying the experimental drug)).
Sorry for the wall of text, but I felt like the medical drama part could have played a bigger role in a bigger story ,at the beginning with sempai learning about touka's disease and touka herself, doing more research on the topic (naming the proper disease (or even creating their own is allowed if done properly with), doing researches on it (maybe with the character learning about the disease in universe by her own reviwing the existing literature, talking about possible treatment protocols (aren't actually that many for allergies))).
This feels like the medical elements are slapped in our face without context with things made just becouse. It's immersion breaking.
The only exception is the drug trial resulting attack (with the above caveat).
I was probably too blunt, some tihngs could actually make sense as is or with few modifications, if the dependat context was provided, but it wasn't.
Also it would have been nice seeing a bulk of the discussion between touka and her father and later the one with the inter. Seeing what kind of assurance our intern doctor made.
Sorry for the rant.