So this game is daunting for somebody who picked it up for the first time.
The translation is not 100% so sometimes it's difficult to understand the systems or even the dialogue.
In contrast to Imouto Life Monochrome which have had only 2 main stats for the sister and 2 main stats for the MC it was easy to navigate.
This game however seems to have included a lot of stuff that are not immediately obvious and there's no clear way to know what you've done wrong or not.
Any chance for a guide for the game? Or at least a TL;DR on how to progress sister's stats and what to focus for MC?
As for me just keep increasing ur stat till day 99th (preparation for boss fight). Voluntary training (muscle for atk -20AP, swing for tec -20AP, meditate for wisdom -10AP). Buy Adventure book in the city (give +2 for each stat) if u have surplus money (as for me at least i keep ~1k). In the weekend u can choose go out then choose big adventure, after adventuring with ur sister u will get stat boost.
Get cooking skill first then fighting skill if available. Get sexual related skill (not position, just skill that increase sister's pleasure and craftman skill that drop her chance to wake up). Watch ur AP, make sure u have max AP when u woke up (sometimes u get random event after guild activities that need AP). You will get 30+ AP after sleep, at some point it will change to 50+ (Green tea give u +10 AP & Energy drink +30 AP).
For guild activities choose contribution to community for reputation+. Every Friday choose talk about dreams to get more reputation. This is important to get skill point and also unlock sleeping tea and suspicious shop.
Make sure u save ur progress everyday! And at night if u want to 'u know what i mean'. Pleasure ur sister at night, take off her pajama once then camisole, caress her boobs. When her state goes to half awake, put all her clothes on then get out/go to sleep. U will automatically shot one.
No need to waste ur time to hunt panties, the sister will give u her panties one at a time at some point.
Sometimes sister will be sick. Do voluntary training to decrease AP. Take bath>choose wipe sister. Then choose look after sister.
When u get 120 trust u can bath together. Always bath together to increase sister's interest. Also u can tickle her to increase interest and lust. When talk option appear in bath choose talk naughty to increase interest till it wont increase anymore, since after that it will only increase lust. Buy naughty and thin book in the city then read it. When sister's interest reach 100 and u have all sexual related skill, its time to take her virginity. But before that u need sleeping tea available.
When u are ready to take her virginity make sure sister have high lust and in love state (snack can increase her mood). When she go to toilet dont peek since sometimes sister will masturbate then her lust decrease. Give sister sleeping tea. Save at night before u start. Make sure sister in 1st position (upper left). Take off her pajama once, then camisole, flip skirt, take off all her short and panties, open her legs then play with her boobs till drowsy. Put ur dick inside. U can save in another slot.
Then start the match, u must make her cum before 1 am (weekday) or 3 am (weekend). Piston, grope boobs and kiss, make sure her bad gauge low (lower than 30%). When sister's pleasure gauge almost full (75%) keep pistoning and kissing (watch ur remaining time), save, then when ur cum gauge reach 80-89% caress her pussy outside. When cum chooice appear, wait till 120 if u have iron will skill or 110 if not then choose cum in tissue (when u piston in sister's climax state ur cum gauge increase faster so becarefull or u can use condom if u want safety, i did rather load though). If u still have remaining time just kiss her, then exit before 1 or 3 pm.
Just repeat above every day to increase interest (sister need 50 lust or more and love state). If u have high lust (90% or more), u can ask sister to suck u in the bath, dont pound her since it will decrease her lust after climax. At night save before climax, choose drink when cum option appear (same state cum in tissue above). If sister reject/hate, load then choose tissue. When she's ok with it u dont need tissue anymore, just let her drink ur cum.
At some point (interest stat), sister's bad gauge wont tend to increase like the first time (this is so realistic IMO). After she reach that point make sure everyday when u make love to ur sister u make her climax twice, u cum once in her mouth (like above) and finished before 1 am or in weekend just exit dont need to wait till 3 am. If the sister smiled with open mouth that mean u win/succed in making her happy (optimal result). U will get a cut scene in the morning when sister wake up. Just repeat this to increase interest.
At some point u can buy after morning pill at suspicious shop in the city, make sure to buy this if u want to creampie ur sister. My advice if u want to do it, do it in Friday, when u make love then reach the state above (almost climax) u dont need to choose cum (just make sure u have iron will skill and cum gauge at 85-95% when sister climax), keep ur deep piston, then when text box (brother want to cum) appear after u reach 130 make sure to click the box when sister's climax reach the 3rd box form the right. The sister' pleasure gauge will increase almost full again after u both climax. Usually sister's mood will drop to good state in the morning, just take a bath and wash her or if still in good state give her a snack. Repeat it in saturday and sunday then make sur u give the sister after morning pill in the monday (if not u will get happy pregnant ending).
For guild activities prioritize contribution (only until unlock suspicious shop) > DEF (since u cant practice DEF in ur house) > ATK > Basic (this to train abilities, usually u get guildmember cutscene after running. This need clarification) > secret training > study (this opition give u poin skill).
As for me in the 99th day (before boss battle), i have ATK 400 (+S), TEC 350 (+S), DEF ~300 (S), GUTS ~300 (S), Wisdom ~300 (S). Sister's trust ~900 and interest ~800. Brave Chaotic Onii-chan.
After u beat the boss u dont need to train anymore. Its the start of ur happy and steamy life with ur sister XD
U can see masturbation event in bathroom (have stealth skill, sister have high lust and u choose to bath alone then peek) and toilet (sister have high lust > give her coffee or tea > if she went to the toilet with flushed expression/squinting eyes while smilling > choose peek. Halfway u will swallow ur spit, if chooice appear choose to open the door/get inside). There is another a close up masturbation event in the bath if u choose cat voice when the sister almost climax. She will ask u to come inside ('open' option will appear).
Get all skill books, sex position, sex toys, and pajamas.
Sometimes there is 'I want to H' option, i think the sister only agree if she have 60 lust or more. U can empty ur ball (energy) inside her in Friday, dont forget to buy after morning pill the next day. Well, if u have too much energy and dump it all inside of her, she will be sick in the next day (usually).
Do adventure with ur sister.
If u are too lazy to grind ur stat, u can use my save file. Its exactly after i beat the black ball boss (99th day).